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 | 30 |
| 5 | 102 |
| 6 | 399 |
| 7 | 1549 |
| 8 | 6331 |
| 9 | 26197 |
| 10 | 111058 |
| 11 | 476943 |
| 12 | 2078542 |
| 13 | 9150328 |
| 14 | 40704579 |
| 15 | 182483318 |
| 16 | 824427887 |
| 17 | 3747916247 |
| 18 | 17138403170 |
| 19 | 78769757858 |
| 20 | 363711035059 |
| 21 | 1686399296077 |
| 22 | 7848812615643 |
| 23 | 36655434057447 |
| 24 | 171727138976925 |
| 25 | 806840773536620 |
| 26 | 3800922650135408 |
| 27 | 17949434069870888 |
| 28 | 84956189865687628 |
[1,1,3,8,30,102,399,1549,6331,26197,111058,476943, 2078542,9150328,40704579,182483318,824427887, 3747916247,17138403170,78769757858,363711035059, 1686399296077,7848812615643,36655434057447, 171727138976925,806840773536620,3800922650135408, 17949434069870888,84956189865687628] |