The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 4 |
| 6 | 10 |
| 7 | 28 |
| 8 | 190 |
| 9 | 3052 |
| 10 | 123196 |
| 11 | 27522064 |
| 12 | 89625932920 |
| 13 | 11318569384820032 |
| 14 | 312907271203608153807520 |
| 15 | 28053218967767813941001154374119168 |
| 16 | 317524819653692484884273872549799784105586335582976 |
[1,1,1,1,4,10,28,190,3052,123196,27522064, 89625932920,11318569384820032, 312907271203608153807520, 28053218967767813941001154374119168, 31752481965369248488427387254979978410558633558297\ 6] |