The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 27 |
| 5 | 94 |
| 6 | 385 |
| 7 | 1673 |
| 8 | 8079 |
| 9 | 41614 |
| 10 | 231447 |
| 11 | 1364697 |
| 12 | 8559575 |
| 13 | 56544465 |
| 14 | 393485452 |
| 15 | 2867908008 |
| 16 | 21869757215 |
| 17 | 173848026202 |
| 18 | 1438593095272 |
| 19 | 12360614782433 |
| 20 | 110119783919367 |
| 21 | 1015289796603359 |
| 22 | 9674959683612989 |
| 23 | 95147388659652754 |
| 24 | 964559157655032720 |
| 25 | 10067421615492769230 |
[1,1,3,8,27,94,385,1673,8079,41614,231447,1364697, 8559575,56544465,393485452,2867908008,21869757215, 173848026202,1438593095272,12360614782433, 110119783919367,1015289796603359,9674959683612989, 95147388659652754,964559157655032720, 10067421615492769230] |