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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 66 |
| 3 | 860 |
| 4 | 5750 |
| 5 | 26265 |
| 6 | 93436 |
| 7 | 278256 |
| 8 | 725220 |
| 9 | 1703625 |
| 10 | 3682030 |
| 11 | 7431996 |
| 12 | 14167946 |
| 13 | 25730705 |
| 14 | 44823000 |
| 15 | 75305920 |
| 16 | 122566056 |
| 17 | 193963761 |
| 18 | 299373690 |
| 19 | 451829500 |
| 20 | 668285310 |
| 21 | 970507241 |
| 22 | 1386109076 |
| 23 | 1949746800 |
| 24 | 2704487500 |
[1,66,860,5750,26265,93436,278256,725220,1703625, 3682030,7431996,14167946,25730705,44823000, 75305920,122566056,193963761,299373690,451829500, 668285310,970507241,1386109076,1949746800, 2704487500] |