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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 22 |
| 2 | 485 |
| 3 | 10692 |
| 4 | 235709 |
| 5 | 5196290 |
| 6 | 114554089 |
| 7 | 2525386248 |
| 8 | 55673051545 |
| 9 | 1227332520238 |
| 10 | 27056988496781 |
| 11 | 596481079449420 |
| 12 | 13149640736384021 |
| 13 | 289888577279897882 |
| 14 | 6390698340894137425 |
| 15 | 140885252076950921232 |
| 16 | 3105866244033814404529 |
| 17 | 68469942620820867820870 |
[1,22,485,10692,235709,5196290,114554089, 2525386248,55673051545,1227332520238, 27056988496781,596481079449420,13149640736384021, 289888577279897882,6390698340894137425, 140885252076950921232,3105866244033814404529, 68469942620820867820870] |