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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 6 |
| 3 | 57 |
| 4 | 272 |
| 5 | 901 |
| 6 | 2376 |
| 7 | 5362 |
| 8 | 10808 |
| 9 | 19998 |
| 10 | 34602 |
| 11 | 56727 |
| 12 | 88968 |
| 13 | 134459 |
| 14 | 196924 |
| 15 | 280728 |
| 16 | 390928 |
| 17 | 533324 |
| 18 | 714510 |
| 19 | 941925 |
| 20 | 1223904 |
| 21 | 1569729 |
| 22 | 1989680 |
| 23 | 2495086 |
| 24 | 3098376 |
| 25 | 3813130 |
| 26 | 4654130 |
| 27 | 5637411 |
| 28 | 6780312 |
| 29 | 8101527 |
| 30 | 9621156 |
| 31 | 11360756 |
[0,0,6,57,272,901,2376,5362,10808,19998,34602, 56727,88968,134459,196924,280728,390928,533324, 714510,941925,1223904,1569729,1989680,2495086, 3098376,3813130,4654130,5637411,6780312,8101527, 9621156,11360756] |