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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 49 |
| 3 | 142 |
| 4 | 458 |
| 5 | 1962 |
| 6 | 6604 |
| 7 | 22446 |
| 8 | 86464 |
| 9 | 311891 |
| 10 | 1100642 |
| 11 | 4051876 |
| 12 | 14751188 |
| 13 | 52994208 |
| 14 | 192694281 |
| 15 | 700643032 |
| 16 | 2533737542 |
| 17 | 9188792804 |
| 18 | 33358655064 |
| 19 | 120883510481 |
| 20 | 438255796512 |
| 21 | 1589816384928 |
| 22 | 5764235810314 |
| 23 | 20899418376356 |
[8,49,142,458,1962,6604,22446,86464,311891, 1100642,4051876,14751188,52994208,192694281, 700643032,2533737542,9188792804,33358655064, 120883510481,438255796512,1589816384928, 5764235810314,20899418376356] |