The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 13 |
| 4 | 36 |
| 5 | 114 |
| 6 | 495 |
| 7 | 2816 |
| 8 | 14138 |
| 9 | 64406 |
| 10 | 288079 |
| 11 | 1310914 |
| 12 | 6040052 |
| 13 | 27971466 |
| 14 | 129714539 |
| 15 | 601185145 |
| 16 | 2783395440 |
| 17 | 12878290842 |
| 18 | 59574077350 |
| 19 | 275601620452 |
| 20 | 1275129562555 |
| 21 | 5900033896489 |
| 22 | 27299793712340 |
| 23 | 126316193270001 |
[1,1,13,36,114,495,2816,14138,64406,288079, 1310914,6040052,27971466,129714539,601185145, 2783395440,12878290842,59574077350,275601620452, 1275129562555,5900033896489,27299793712340, 126316193270001] |