The OEIS is supported by the many generous donors to the OEIS Foundation.
A347571 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 9 |
| 5 | 44 |
| 6 | 280 |
| 7 | 2064 |
| 8 | 17528 |
| 9 | 167488 |
| 10 | 1777536 |
| 11 | 20721920 |
| 12 | 263055232 |
| 13 | 3610443264 |
| 14 | 53256280064 |
| 15 | 839974309888 |
| 16 | 14103897738240 |
| 17 | 251146689069056 |
| 18 | 4726795773018112 |
| 19 | 93746994502828032 |
| 20 | 1954053073794596864 |
| 21 | 42702893781890498560 |
| 22 | 976276451410488066048 |
| 23 | 23303485413254033309696 |
[1,0,1,2,9,44,280,2064,17528,167488,1777536, 20721920,263055232,3610443264,53256280064, 839974309888,14103897738240,251146689069056, 4726795773018112,93746994502828032, 1954053073794596864,42702893781890498560, 976276451410488066048,23303485413254033309696] |