OFFSET
0,2
LINKS
Dragomir Z. Djokovic, Poincaré series [or Poincare series] of some pure and mixed trace algebras of two generic matrices. See Table 8.
FORMULA
G.f. =
(x^88+x^87+5*x^86+20*x^85+76*x^84+227*x^83+692*x^82+1933*x^81+5307*x^80+13752*x^79+34304*x^78+81525*x^77+
186346*x^76+408071*x^75+860437*x^74+1746504*x^73+3421732*x^72+6474866*x^71+11857662*x^70+21033945*x^69+
36195856*x^68+60479854*x^67+98242554*x^66+155273212*x^65+239019423*x^64+358621723*x^63+524884888*x^62+
749897456*x^61+1046516425*x^60+1427383948*x^59+1903851664*x^58+2484438301*x^57+3173436196*x^56+3969248353*x^55+
4863282209*x^54+5838905156*x^53+6871421892*x^52+7928353846*x^51+8971036674*x^50+9956478001*x^49+
10840418189*x^48+11580232480*x^47+12138549745*x^46+12485984964*x^45+12603960344*x^44+12485984964*x^43+
12138549745*x^42+11580232480*x^41+10840418189*x^40+9956478001*x^39+8971036674*x^38+7928353846*x^37+6871421892*x^36+
5838905156*x^35+4863282209*x^34+3969248353*x^33+3173436196*x^32+2484438301*x^31+1903851664*x^30+
1427383948*x^29+1046516425*x^28+749897456*x^27+524884888*x^26+358621723*x^25+239019423*x^24+155273212*x^23+
98242554*x^22+60479854*x^21+36195856*x^20+21033945*x^19+11857662*x^18+6474866*x^17+3421732*x^16+1746504*x^15+
860437*x^14+408071*x^13+186346*x^12+81525*x^11+34304*x^10+13752*x^9+5307*x^8+1933*x^7+692*x^6+227*x^5+76*x^4+
20*x^3+5*x^2+x+1) /
((1-x)*(1-x^2)^3*(1-x^3)^4*(1-x^4)^5*(1-x^5)^5*(1-x^6)^3*(1-x^7)^2*(1-x^8)*(1-x^9)).
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 21 2006
STATUS
approved