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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 231 |
| 3 | 26796 |
| 4 | 1186570 |
| 5 | 26357430 |
| 6 | 359026206 |
| 7 | 3413156131 |
| 8 | 24666759216 |
| 9 | 143717956515 |
| 10 | 703974775735 |
| 11 | 2989908659661 |
| 12 | 11270904497931 |
| 13 | 38398515291136 |
| 14 | 119929709686710 |
| 15 | 347357071281165 |
| 16 | 941718655098991 |
| 17 | 2408309883851256 |
| 18 | 5847191602173306 |
| 19 | 13551450210950905 |
[0,1,231,26796,1186570,26357430,359026206, 3413156131,24666759216,143717956515,703974775735, 2989908659661,11270904497931,38398515291136, 119929709686710,347357071281165,941718655098991, 2408309883851256,5847191602173306, 13551450210950905] |