The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 14 |
| 3 | 1 |
| 4 | 21 |
| 5 | 210 |
| 6 | 1 |
| 7 | 28 |
| 8 | 378 |
| 9 | 3220 |
| 10 | 1 |
| 11 | 35 |
| 12 | 595 |
| 13 | 6475 |
| 14 | 49910 |
| 15 | 1 |
| 16 | 42 |
| 17 | 861 |
| 18 | 11396 |
| 19 | 108402 |
| 20 | 778596 |
| 21 | 1 |
| 22 | 49 |
| 23 | 1176 |
| 24 | 18326 |
| 25 | 207074 |
| 26 | 1791930 |
| 27 | 12198004 |
| 28 | 1 |
| 29 | 56 |
| 30 | 1540 |
| 31 | 27608 |
| 32 | 361018 |
| 33 | 3647672 |
| 34 | 29389492 |
| 35 | 191682920 |
| 36 | 1 |
| 37 | 63 |
| 38 | 1953 |
| 39 | 39585 |
| 40 | 587727 |
| 41 | 6783147 |
[1,1,14,1,21,210,1,28,378,3220,1,35,595,6475, 49910,1,42,861,11396,108402,778596,1,49,1176, 18326,207074,1791930,12198004,1,56,1540,27608, 361018,3647672,29389492,191682920,1,63,1953,39585, 587727,6783147] |