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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 12 |
| 3 | 326 |
| 4 | 12210 |
| 5 | 497166 |
| 6 | 21835516 |
| 7 | 888633610 |
| 8 | 37511690680 |
| 9 | 1575024801010 |
| 10 | 65857595528130 |
| 11 | 2767152819316108 |
| 12 | 115921366835256538 |
| 13 | 4863791239252964166 |
| 14 | 203925622348965051300 |
| 15 | 8552837284722587592810 |
| 16 | 358663019377259939567606 |
[0,12,326,12210,497166,21835516,888633610, 37511690680,1575024801010,65857595528130, 2767152819316108,115921366835256538, 4863791239252964166,203925622348965051300, 8552837284722587592810,358663019377259939567606] |