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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 251 |
| 4 | 8858 |
| 5 | 425534 |
| 6 | 25928068 |
| 7 | 1916213928 |
| 8 | 166580610504 |
| 9 | 16657218047328 |
| 10 | 1883646389742624 |
| 11 | 237695994684785592 |
| 12 | 33113333472295201536 |
| 13 | 5047818696187818951984 |
| 14 | 835818979837614364874496 |
| 15 | 149383091745519898076484480 |
| 16 | 28663410267058615074689247360 |
| 17 | 5877004345535507714104006175616 |
[1,1,11,251,8858,425534,25928068,1916213928, 166580610504,16657218047328,1883646389742624, 237695994684785592,33113333472295201536, 5047818696187818951984,835818979837614364874496, 149383091745519898076484480, 28663410267058615074689247360, 5877004345535507714104006175616] |