The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 41 |
| 4 | 168 |
| 5 | 727 |
| 6 | 3219 |
| 7 | 14413 |
| 8 | 65753 |
| 9 | 301757 |
| 10 | 1398665 |
| 11 | 6523081 |
| 12 | 30582968 |
| 13 | 144132159 |
| 14 | 681785699 |
| 15 | 3237085331 |
| 16 | 15416598377 |
| 17 | 73621489721 |
| 18 | 352454733824 |
| 19 | 1691006510764 |
| 20 | 8129254763605 |
| 21 | 39151020033494 |
| 22 | 188860503597557 |
| 23 | 912424715585327 |
| 24 | 4414179532977892 |
| 25 | 21382355779573120 |
| 26 | 103698957821381670 |
[1,3,10,41,168,727,3219,14413,65753,301757, 1398665,6523081,30582968,144132159,681785699, 3237085331,15416598377,73621489721,352454733824, 1691006510764,8129254763605,39151020033494, 188860503597557,912424715585327,4414179532977892, 21382355779573120,103698957821381670] |