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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 44 |
| 5 | 215 |
| 6 | 1252 |
| 7 | 7992 |
| 8 | 56024 |
| 9 | 438341 |
| 10 | 3672328 |
| 11 | 32587366 |
| 12 | 318586880 |
| 13 | 3325053147 |
| 14 | 35115462592 |
| 15 | 407034567076 |
| 16 | 5198294627456 |
| 17 | 63965057355305 |
| 18 | 824995119961984 |
| 19 | 12611299833296898 |
| 20 | 184189806819806720 |
| 21 | 2590874864719588031 |
| 22 | 44912343151409875456 |
| 23 | 728583107189913021328 |
| 24 | 11458864344772729650176 |
[1,1,3,10,44,215,1252,7992,56024,438341,3672328, 32587366,318586880,3325053147,35115462592, 407034567076,5198294627456,63965057355305, 824995119961984,12611299833296898, 184189806819806720,2590874864719588031, 44912343151409875456,728583107189913021328, 11458864344772729650176] |