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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 30 |
| 4 | 460 |
| 5 | 10630 |
| 6 | 324516 |
| 7 | 12271518 |
| 8 | 553275192 |
| 9 | 28987537806 |
| 10 | 1731030733840 |
| 11 | 116068178638786 |
| 12 | 8634941165110140 |
| 13 | 705873715441872276 |
| 14 | 62895036883536770108 |
| 15 | 6067037854078500844740 |
| 16 | 629921975126483973659888 |
| 17 | 70043473196734767582082246 |
[1,1,2,30,460,10630,324516,12271518,553275192, 28987537806,1731030733840,116068178638786, 8634941165110140,705873715441872276, 62895036883536770108,6067037854078500844740, 629921975126483973659888, 70043473196734767582082246] |