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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 8 |
| 4 | 50 |
| 5 | 635 |
| 6 | 13389 |
| 7 | 420865 |
| 8 | 18491156 |
| 9 | 1084804118 |
| 10 | 82081329459 |
| 11 | 7794746829520 |
| 12 | 908790397019076 |
| 13 | 127745867968533747 |
| 14 | 21322592031518420776 |
| 15 | 4171751138526111626665 |
| 16 | 946103460280012610769060 |
[1,2,3,8,50,635,13389,420865,18491156,1084804118, 82081329459,7794746829520,908790397019076, 127745867968533747,21322592031518420776, 4171751138526111626665,946103460280012610769060] |