The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 1 |
| 5 | 21 |
| 6 | 8 |
| 7 | 31 |
| 8 | 1 |
| 9 | 123 |
| 10 | 55 |
| 11 | 459 |
| 12 | 12 |
| 13 | 705 |
| 14 | 71 |
| 15 | 247 |
| 16 | 1 |
| 17 | 951 |
| 18 | 460 |
| 19 | 14175 |
| 20 | 119 |
| 21 | 49275 |
| 22 | 2825 |
| 23 | 19305 |
| 24 | 18 |
| 25 | 30075 |
| 26 | 3745 |
| 27 | 105975 |
| 28 | 167 |
| 29 | 40845 |
| 30 | 886 |
| 31 | 2927 |
| 32 | 1 |
| 33 | 11091 |
| 34 | 5585 |
| 35 | 789075 |
| 36 | 1554 |
| 37 | 10546875 |
| 38 | 175175 |
| 39 | 4276125 |
| 40 | 275 |
| 41 | 14482125 |
| 42 | 1004500 |
| 43 | 186553125 |
| 44 | 13573 |
| 45 | 77371875 |
| 46 | 264775 |
| 47 | 1656585 |
| 48 | 24 |
| 49 | 2599275 |
| 50 | 354515 |
| 51 | 169509375 |
| 52 | 19789 |
| 53 | 566409375 |
| 54 | 2055550 |
| 55 | 48691125 |
| 56 | 311 |
[0,1,1,5,1,21,8,31,1,123,55,459,12,705,71,247,1, 951,460,14175,119,49275,2825,19305,18,30075,3745, 105975,167,40845,886,2927,1,11091,5585,789075, 1554,10546875,175175,4276125,275,14482125,1004500, 186553125,13573,77371875,264775,1656585,24, 2599275,354515,169509375,19789,566409375,2055550, 48691125,311] |