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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 94 |
| 5 | 1386 |
| 6 | 29146 |
| 7 | 822928 |
| 8 | 29927612 |
| 9 | 1359897724 |
| 10 | 75429391276 |
| 11 | 5013317213136 |
| 12 | 393252908602720 |
| 13 | 35947138247529952 |
| 14 | 3787896504780614864 |
| 15 | 455830291523748797776 |
| 16 | 62132218311858089750416 |
| 17 | 9523376536749853754046864 |
| 18 | 1630878867943272798422352400 |
| 19 | 310238352508716702644975872192 |
[1,1,2,10,94,1386,29146,822928,29927612, 1359897724,75429391276,5013317213136, 393252908602720,35947138247529952, 3787896504780614864,455830291523748797776, 62132218311858089750416,9523376536749853754046864, 1630878867943272798422352400, 310238352508716702644975872192] |