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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 14 |
| 3 | 104 |
| 4 | 231 |
| 5 | 1665 |
| 6 | 3689 |
| 7 | 26543 |
| 8 | 58800 |
| 9 | 423030 |
| 10 | 937118 |
| 11 | 6741944 |
| 12 | 14935095 |
| 13 | 107448081 |
| 14 | 238024409 |
| 15 | 1712427359 |
| 16 | 3793455456 |
| 17 | 27291389670 |
| 18 | 60457262894 |
| 19 | 434949807368 |
| 20 | 963522750855 |
| 21 | 6931905528225 |
| 22 | 15355906750793 |
| 23 | 110475538644239 |
| 24 | 244730985261840 |
[0,6,14,104,231,1665,3689,26543,58800,423030, 937118,6741944,14935095,107448081,238024409, 1712427359,3793455456,27291389670,60457262894, 434949807368,963522750855,6931905528225, 15355906750793,110475538644239,244730985261840] |