The OEIS is supported by the many generous donors to the OEIS Foundation.
A296727 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 20 |
| 5 | 109 |
| 6 | 654 |
| 7 | 4353 |
| 8 | 34824 |
| 9 | 324441 |
| 10 | 3244410 |
| 11 | 34795485 |
| 12 | 417545820 |
| 13 | 5536151685 |
| 14 | 77506123590 |
| 15 | 1144330385625 |
| 16 | 18309286170000 |
| 17 | 315366695240625 |
| 18 | 5676600514331250 |
| 19 | 106667957800963125 |
| 20 | 2133359156019262500 |
| 21 | 45229212438054868125 |
| 22 | 995042673637207098750 |
| 23 | 22696937952367956440625 |
[0,1,2,5,20,109,654,4353,34824,324441,3244410, 34795485,417545820,5536151685,77506123590, 1144330385625,18309286170000,315366695240625, 5676600514331250,106667957800963125, 2133359156019262500,45229212438054868125, 995042673637207098750,22696937952367956440625] |