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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 3 |
| 7 | 12 |
| 8 | 24 |
| 9 | 60 |
| 10 | 100 |
| 11 | 205 |
| 12 | 315 |
| 13 | 630 |
| 14 | 980 |
| 15 | 2156 |
| 16 | 3528 |
| 17 | 8260 |
| 18 | 13692 |
| 19 | 31620 |
| 20 | 51600 |
| 21 | 115995 |
| 22 | 186945 |
| 23 | 418825 |
| 24 | 675675 |
| 25 | 1535391 |
| 26 | 2492919 |
| 27 | 5728086 |
| 28 | 9324406 |
| 29 | 21448791 |
| 30 | 34860553 |
| 31 | 80006668 |
| 32 | 129804808 |
| 33 | 298009048 |
| 34 | 483483128 |
| 35 | 1113181012 |
| 36 | 1807560972 |
| 37 | 4172914197 |
[0,0,0,0,1,3,12,24,60,100,205,315,630,980,2156, 3528,8260,13692,31620,51600,115995,186945,418825, 675675,1535391,2492919,5728086,9324406,21448791, 34860553,80006668,129804808,298009048,483483128, 1113181012,1807560972,4172914197] |