The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 31 |
| 4 | 526 |
| 5 | 11907 |
| 6 | 328980 |
| 7 | 10580531 |
| 8 | 384937042 |
| 9 | 15549217485 |
| 10 | 688430225102 |
| 11 | 33096289502982 |
| 12 | 1715499922758709 |
| 13 | 95339852384471586 |
| 14 | 5655337634718941111 |
| 15 | 356683962066445400017 |
| 16 | 23840465113068534382248 |
| 17 | 1683771696557415075462436 |
| 18 | 125327912444852044066759399 |
[1,1,3,31,526,11907,328980,10580531,384937042, 15549217485,688430225102,33096289502982, 1715499922758709,95339852384471586, 5655337634718941111,356683962066445400017, 23840465113068534382248,1683771696557415075462436, 125327912444852044066759399] |