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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 3 |
| 7 | 6 |
| 8 | 24 |
| 9 | 40 |
| 10 | 100 |
| 11 | 150 |
| 12 | 315 |
| 13 | 455 |
| 14 | 980 |
| 15 | 1470 |
| 16 | 3528 |
| 17 | 5544 |
| 18 | 13692 |
| 19 | 21630 |
| 20 | 51600 |
| 21 | 80520 |
| 22 | 186945 |
| 23 | 290400 |
| 24 | 675675 |
| 25 | 1056627 |
| 26 | 2492919 |
| 27 | 3929926 |
| 28 | 9324406 |
| 29 | 14742910 |
| 30 | 34860553 |
| 31 | 55107598 |
| 32 | 129804808 |
| 33 | 205272008 |
| 34 | 483483128 |
| 35 | 765991032 |
| 36 | 1807560972 |
| 37 | 2869786524 |
| 38 | 6779169543 |
[0,0,0,0,0,3,6,24,40,100,150,315,455,980,1470, 3528,5544,13692,21630,51600,80520,186945,290400, 675675,1056627,2492919,3929926,9324406,14742910, 34860553,55107598,129804808,205272008,483483128, 765991032,1807560972,2869786524,6779169543] |