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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 13 |
| 4 | 132 |
| 5 | 2492 |
| 6 | 76726 |
| 7 | 4048401 |
| 8 | 360486616 |
| 9 | 54950141846 |
| 10 | 14338767268684 |
| 11 | 6424397920197266 |
| 12 | 4947731418324541980 |
| 13 | 6554636080888858780850 |
| 14 | 14947781374271898418583534 |
| 15 | 58699996835841575449007944393 |
| 16 | 397110307362512858324163841229032 |
[1,1,2,13,132,2492,76726,4048401,360486616, 54950141846,14338767268684,6424397920197266, 4947731418324541980,6554636080888858780850, 14947781374271898418583534, 58699996835841575449007944393, 397110307362512858324163841229032] |