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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 24 |
| 3 | 90 |
| 4 | 220 |
| 5 | 435 |
| 6 | 756 |
| 7 | 1204 |
| 8 | 1800 |
| 9 | 2565 |
| 10 | 3520 |
| 11 | 4686 |
| 12 | 6084 |
| 13 | 7735 |
| 14 | 9660 |
| 15 | 11880 |
| 16 | 14416 |
| 17 | 17289 |
| 18 | 20520 |
| 19 | 24130 |
| 20 | 28140 |
| 21 | 32571 |
| 22 | 37444 |
| 23 | 42780 |
| 24 | 48600 |
| 25 | 54925 |
| 26 | 61776 |
| 27 | 69174 |
| 28 | 77140 |
| 29 | 85695 |
| 30 | 94860 |
| 31 | 104656 |
| 32 | 115104 |
| 33 | 126225 |
| 34 | 138040 |
| 35 | 150570 |
| 36 | 163836 |
| 37 | 177859 |
| 38 | 192660 |
[0,1,24,90,220,435,756,1204,1800,2565,3520,4686, 6084,7735,9660,11880,14416,17289,20520,24130, 28140,32571,37444,42780,48600,54925,61776,69174, 77140,85695,94860,104656,115104,126225,138040, 150570,163836,177859,192660] |