The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 29 |
| 4 | 185 |
| 5 | 1226 |
| 6 | 8553 |
| 7 | 61642 |
| 8 | 455337 |
| 9 | 3429002 |
| 10 | 26229691 |
| 11 | 203237747 |
| 12 | 1591820564 |
| 13 | 12582288455 |
| 14 | 100241042348 |
| 15 | 804090987555 |
| 16 | 6488942266564 |
| 17 | 52644171729304 |
| 18 | 429123506792664 |
| 19 | 3512829202462126 |
| 20 | 28866426741057006 |
| 21 | 238031465396515626 |
| 22 | 1969001793889730276 |
[1,1,5,29,185,1226,8553,61642,455337,3429002, 26229691,203237747,1591820564,12582288455, 100241042348,804090987555,6488942266564, 52644171729304,429123506792664,3512829202462126, 28866426741057006,238031465396515626, 1969001793889730276] |