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PROG
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(PARI) {a(n) = my(A=[1]); for(i=1, n, A=concat(A, 0);
A[#A] = polcoeff( sum(n=-#A, #A, n*(n+1)/2 * x^n * if(n==-1, 0, (1 - x^(n+1) +x*O(x^#A) )^n) * Ser(A)^(n+1) ), #A-1) ); A[n+1]}
for(n=0, 30, print1(a(n), ", "))
(PARI) {a(n) = my(A=[1]); for(i=1, n, A=concat(A, 0);
A[#A] = polcoeff( sum(n=-#A, #A, (-1)^n * n*(n-1)/2 * x^(n*(n-2)) * if(n==1, 0, 1/(1 - x^(n-1) +x*O(x^#A) )^n) / Ser(A)^(n-1) ), #A-1) ); A[n+1]}
for(n=0, 30, print1(a(n), ", "))
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