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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 12 |
| 3 | 96 |
| 4 | 529 |
| 5 | 4843 |
| 6 | 44264 |
| 7 | 352713 |
| 8 | 2840274 |
| 9 | 23795758 |
| 10 | 197390196 |
| 11 | 1619132059 |
| 12 | 13345740560 |
| 13 | 110326933611 |
| 14 | 910298134238 |
| 15 | 7505842151352 |
| 16 | 61932503872184 |
| 17 | 511075503235669 |
| 18 | 4216464623838747 |
| 19 | 34786555887673881 |
| 20 | 287016646384919794 |
[0,12,96,529,4843,44264,352713,2840274,23795758, 197390196,1619132059,13345740560,110326933611, 910298134238,7505842151352,61932503872184, 511075503235669,4216464623838747, 34786555887673881,287016646384919794] |