The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 76 |
| 4 | 134 |
| 5 | 213 |
| 6 | 1649 |
| 7 | 1955 |
| 8 | 2041 |
| 9 | 32363 |
| 10 | 217167 |
| 11 | 760577 |
| 12 | 1633080 |
| 13 | 6412486 |
| 14 | 24932290 |
| 15 | 25544312 |
| 16 | 376841489 |
| 17 | 426956719 |
| 18 | 472747939 |
| 19 | 765965856 |
| 20 | 2708004694 |
| 21 | 5814287795 |
| 22 | 14630348817 |
| 23 | 21857959576 |
| 24 | 92077240148 |
| 25 | 184486528542 |
[1,4,76,134,213,1649,1955,2041,32363,217167, 760577,1633080,6412486,24932290,25544312, 376841489,426956719,472747939,765965856, 2708004694,5814287795,14630348817,21857959576, 92077240148,184486528542] |