The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 15 |
| 6 | 44 |
| 7 | 91 |
| 8 | 286 |
| 9 | 633 |
| 10 | 2072 |
| 11 | 4796 |
| 12 | 16180 |
| 13 | 38727 |
| 14 | 133548 |
| 15 | 327895 |
| 16 | 1150226 |
| 17 | 2881857 |
| 18 | 10247072 |
| 19 | 26099008 |
| 20 | 93830568 |
| 21 | 242264113 |
| 22 | 878987980 |
| 23 | 2295723288 |
| 24 | 8393889812 |
| 25 | 22139557300 |
| 26 | 81484257064 |
| 27 | 216757035756 |
| 28 | 802324361696 |
| 29 | 2150196732767 |
| 30 | 7998562017700 |
| 31 | 21576806128743 |
| 32 | 80615634684738 |
[1,1,2,3,8,15,44,91,286,633,2072,4796,16180,38727, 133548,327895,1150226,2881857,10247072,26099008, 93830568,242264113,878987980,2295723288, 8393889812,22139557300,81484257064,216757035756, 802324361696,2150196732767,7998562017700, 21576806128743,80615634684738] |