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A369921 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 18 |
| 4 | 204 |
| 5 | 2940 |
| 6 | 56670 |
| 7 | 1471806 |
| 8 | 52067512 |
| 9 | 2520298584 |
| 10 | 167850357210 |
| 11 | 15435027907530 |
| 12 | 1967345286257604 |
| 13 | 348527628228821652 |
| 14 | 86057693880611800438 |
| 15 | 29677160119074814383030 |
| 16 | 14321851348104417100842480 |
[0,0,2,18,204,2940,56670,1471806,52067512, 2520298584,167850357210,15435027907530, 1967345286257604,348527628228821652, 86057693880611800438,29677160119074814383030, 14321851348104417100842480] |