The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 129 |
| 4 | 2316 |
| 5 | 94510 |
| 6 | 4939220 |
| 7 | 211106945 |
| 8 | 14879165560 |
| 9 | 828070125876 |
| 10 | 61472962084968 |
| 11 | 4223017425122958 |
| 12 | 325536754765395096 |
| 13 | 25399546083773839692 |
| 14 | 2059386837863675003112 |
| 15 | 173281152533121109073025 |
| 16 | 14789443838781868027714800 |
| 17 | 1307994690673355979749969800 |
[1,1,2,129,2316,94510,4939220,211106945, 14879165560,828070125876,61472962084968, 4223017425122958,325536754765395096, 25399546083773839692,2059386837863675003112, 173281152533121109073025, 14789443838781868027714800, 1307994690673355979749969800] |