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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 414 |
| 4 | 124880 |
| 5 | 2090520 |
| 6 | 9934272 |
| 7 | 29607932 |
| 8 | 65963326 |
| 9 | 123580937 |
| 10 | 204771252 |
| 11 | 310971475 |
| 12 | 441931786 |
| 13 | 597915172 |
| 14 | 777662238 |
| 15 | 981570648 |
| 16 | 1208872830 |
| 17 | 1459728029 |
| 18 | 1734003242 |
| 19 | 2031698469 |
| 20 | 2352813710 |
| 21 | 2697348965 |
| 22 | 3065304234 |
| 23 | 3456679517 |
[0,0,414,124880,2090520,9934272,29607932,65963326, 123580937,204771252,310971475,441931786,597915172, 777662238,981570648,1208872830,1459728029, 1734003242,2031698469,2352813710,2697348965, 3065304234,3456679517] |