The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 4 |
| 5 | 18 |
| 6 | 34 |
| 7 | 11 |
| 8 | 353 |
| 9 | 1046 |
| 10 | 499 |
| 11 | 41 |
| 12 | 7434 |
| 13 | 147943 |
| 14 | 108893 |
| 15 | 10507 |
| 16 | 162 |
| 17 | 198052 |
| 18 | 21418431 |
| 19 | 96673866 |
| 20 | 13701111 |
| 21 | 272410 |
| 22 | 714 |
| 23 | 5731144 |
| 24 | 3375824210 |
| 25 | 76892349394 |
| 26 | 68272896836 |
| 27 | 1808609113 |
| 28 | 7817980 |
| 29 | 3397 |
| 30 | 172707247 |
| 31 | 537471327779 |
[1,1,4,4,18,34,11,353,1046,499,41,7434,147943, 108893,10507,162,198052,21418431,96673866, 13701111,272410,714,5731144,3375824210, 76892349394,68272896836,1808609113,7817980,3397, 172707247,537471327779] |