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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 40 |
| 4 | 2640 |
| 5 | 14520 |
| 6 | 39792 |
| 7 | 78168 |
| 8 | 128688 |
| 9 | 191068 |
| 10 | 265280 |
| 11 | 351324 |
| 12 | 449200 |
| 13 | 558908 |
| 14 | 680448 |
| 15 | 813820 |
| 16 | 959024 |
| 17 | 1116060 |
| 18 | 1284928 |
| 19 | 1465628 |
| 20 | 1658160 |
| 21 | 1862524 |
| 22 | 2078720 |
| 23 | 2306748 |
| 24 | 2546608 |
| 25 | 2798300 |
| 26 | 3061824 |
| 27 | 3337180 |
| 28 | 3624368 |
| 29 | 3923388 |
| 30 | 4234240 |
| 31 | 4556924 |
[0,0,40,2640,14520,39792,78168,128688,191068, 265280,351324,449200,558908,680448,813820,959024, 1116060,1284928,1465628,1658160,1862524,2078720, 2306748,2546608,2798300,3061824,3337180,3624368, 3923388,4234240,4556924] |