The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 6 |
| 5 | 1 |
| 6 | 1 |
| 7 | 22 |
| 8 | 22 |
| 9 | 1 |
| 10 | 1 |
| 11 | 65 |
| 12 | 220 |
| 13 | 65 |
| 14 | 1 |
| 15 | 1 |
| 16 | 171 |
| 17 | 1510 |
| 18 | 1510 |
| 19 | 171 |
| 20 | 1 |
| 21 | 1 |
| 22 | 420 |
| 23 | 8337 |
| 24 | 21140 |
| 25 | 8337 |
| 26 | 420 |
| 27 | 1 |
| 28 | 1 |
| 29 | 988 |
| 30 | 40068 |
| 31 | 218666 |
| 32 | 218666 |
| 33 | 40068 |
| 34 | 988 |
| 35 | 1 |
| 36 | 1 |
| 37 | 2259 |
| 38 | 175296 |
| 39 | 1852914 |
| 40 | 3935988 |
| 41 | 1852914 |
| 42 | 175296 |
| 43 | 2259 |
| 44 | 1 |
| 45 | 1 |
| 46 | 5065 |
| 47 | 717600 |
| 48 | 13655760 |
| 49 | 55034868 |
| 50 | 55034868 |
| 51 | 13655760 |
| 52 | 717600 |
| 53 | 5065 |
| 54 | 1 |
[1,1,1,1,6,1,1,22,22,1,1,65,220,65,1,1,171,1510, 1510,171,1,1,420,8337,21140,8337,420,1,1,988, 40068,218666,218666,40068,988,1,1,2259,175296, 1852914,3935988,1852914,175296,2259,1,1,5065, 717600,13655760,55034868,55034868,13655760,717600, 5065,1] |