The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 31 |
| 5 | 781 |
| 6 | 20156 |
| 7 | 2460781 |
| 8 | 317398281 |
| 9 | 192565913906 |
| 10 | 124176269429531 |
| 11 | 376229476867085781 |
| 12 | 1213035110624630757656 |
| 13 | 18371792960261297531148281 |
| 14 | 296169521847801754865890523281 |
| 15 | 22426801247965814514582357345601406 |
[0,1,1,6,31,781,20156,2460781,317398281, 192565913906,124176269429531,376229476867085781, 1213035110624630757656,18371792960261297531148281, 296169521847801754865890523281, 22426801247965814514582357345601406] |