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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 32 |
| 4 | 734 |
| 5 | 28994 |
| 6 | 1752046 |
| 7 | 150262104 |
| 8 | 17356844088 |
| 9 | 2597710341600 |
| 10 | 488957612319984 |
| 11 | 113044488306692304 |
| 12 | 31490845086661001664 |
| 13 | 10403092187976909854640 |
| 14 | 4021236906890850070201488 |
| 15 | 1798052050351216209712206336 |
| 16 | 920859156623446912386646303104 |
[0,1,3,32,734,28994,1752046,150262104,17356844088, 2597710341600,488957612319984,113044488306692304, 31490845086661001664,10403092187976909854640, 4021236906890850070201488, 1798052050351216209712206336, 920859156623446912386646303104] |