The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 12 |
| 5 | 58 |
| 6 | 323 |
| 7 | 2026 |
| 8 | 14125 |
| 9 | 108472 |
| 10 | 911203 |
| 11 | 8326290 |
| 12 | 82382317 |
| 13 | 879231033 |
| 14 | 10088749986 |
| 15 | 124101412790 |
| 16 | 1632187723201 |
| 17 | 22895274500999 |
| 18 | 341738132438907 |
| 19 | 5415659970194984 |
| 20 | 90928786402251744 |
| 21 | 1614244644876588572 |
| 22 | 30243386104969900766 |
| 23 | 596915061724923842269 |
[1,1,3,12,58,323,2026,14125,108472,911203,8326290, 82382317,879231033,10088749986,124101412790, 1632187723201,22895274500999,341738132438907, 5415659970194984,90928786402251744, 1614244644876588572,30243386104969900766, 596915061724923842269] |