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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 220 |
| 4 | 4873 |
| 5 | 145446 |
| 6 | 5479639 |
| 7 | 249736936 |
| 8 | 13366083889 |
| 9 | 821950542730 |
| 10 | 57117681241471 |
| 11 | 4426656694204020 |
| 12 | 378577567656396409 |
| 13 | 35416929943920575662 |
| 14 | 3598006167290727776263 |
| 15 | 394460149364865110384896 |
| 16 | 46420283015545052734709473 |
| 17 | 5836509710708683465245181458 |
[1,2,15,220,4873,145446,5479639,249736936, 13366083889,821950542730,57117681241471, 4426656694204020,378577567656396409, 35416929943920575662,3598006167290727776263, 394460149364865110384896, 46420283015545052734709473, 5836509710708683465245181458] |