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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 115 |
| 4 | 2108 |
| 5 | 52006 |
| 6 | 1606229 |
| 7 | 59550709 |
| 8 | 2575966264 |
| 9 | 127343893378 |
| 10 | 7081926869746 |
| 11 | 437585883729512 |
| 12 | 29740614295527535 |
| 13 | 2205002457135885616 |
| 14 | 177099066222770055407 |
| 15 | 15317784128757306540986 |
| 16 | 1419476705128570400447376 |
[1,2,10,115,2108,52006,1606229,59550709, 2575966264,127343893378,7081926869746, 437585883729512,29740614295527535, 2205002457135885616,177099066222770055407, 15317784128757306540986,1419476705128570400447376] |