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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 12 |
| 3 | 810 |
| 4 | 143360 |
| 5 | 49218750 |
| 6 | 27935373312 |
| 7 | 23751648836916 |
| 8 | 28301429298954240 |
| 9 | 45046920790988254710 |
| 10 | 92378000000000000000000 |
| 11 | 237289687212632836205339916 |
| 12 | 746430126201849206626773368832 |
| 13 | 2822726846177838977566127355808300 |
[0,1,12,810,143360,49218750,27935373312, 23751648836916,28301429298954240, 45046920790988254710,92378000000000000000000, 237289687212632836205339916, 746430126201849206626773368832, 2822726846177838977566127355808300] |