The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 1 |
| 3 | 21 |
| 4 | 6 |
| 5 | 1 |
| 6 | 165 |
| 7 | 45 |
| 8 | 9 |
| 9 | 1 |
| 10 | 1820 |
| 11 | 455 |
| 12 | 91 |
| 13 | 13 |
| 14 | 1 |
| 15 | 26334 |
| 16 | 5985 |
| 17 | 1140 |
| 18 | 171 |
| 19 | 18 |
| 20 | 1 |
| 21 | 475020 |
| 22 | 98280 |
| 23 | 17550 |
| 24 | 2600 |
| 25 | 300 |
| 26 | 24 |
| 27 | 1 |
| 28 | 10295472 |
| 29 | 1947792 |
| 30 | 324632 |
| 31 | 46376 |
| 32 | 5456 |
| 33 | 496 |
| 34 | 31 |
| 35 | 1 |
| 36 | 260932815 |
| 37 | 45379620 |
| 38 | 7059052 |
| 39 | 962598 |
| 40 | 111930 |
| 41 | 10660 |
| 42 | 780 |
| 43 | 39 |
| 44 | 1 |
[1,4,1,21,6,1,165,45,9,1,1820,455,91,13,1,26334, 5985,1140,171,18,1,475020,98280,17550,2600,300,24, 1,10295472,1947792,324632,46376,5456,496,31,1, 260932815,45379620,7059052,962598,111930,10660, 780,39,1] |