The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 0 |
| 7 | 1 |
| 8 | 9 |
| 9 | 13 |
| 10 | 0 |
| 11 | 1 |
| 12 | 21 |
| 13 | 78 |
| 14 | 73 |
| 15 | 0 |
| 16 | 1 |
| 17 | 45 |
| 18 | 325 |
| 19 | 730 |
| 20 | 501 |
| 21 | 0 |
| 22 | 1 |
| 23 | 93 |
| 24 | 1170 |
| 25 | 4745 |
| 26 | 7515 |
| 27 | 4051 |
| 28 | 0 |
| 29 | 1 |
| 30 | 189 |
| 31 | 3913 |
| 32 | 25550 |
| 33 | 70140 |
| 34 | 85071 |
| 35 | 37633 |
| 36 | 0 |
| 37 | 1 |
| 38 | 381 |
| 39 | 12558 |
| 40 | 124173 |
| 41 | 526050 |
| 42 | 1077566 |
| 43 | 1053724 |
| 44 | 394353 |
| 45 | 0 |
| 46 | 1 |
| 47 | 765 |
| 48 | 39325 |
| 49 | 567210 |
| 50 | 3482451 |
| 51 | 10718946 |
| 52 | 17386446 |
| 53 | 14196708 |
| 54 | 4596553 |
[1,0,1,0,1,3,0,1,9,13,0,1,21,78,73,0,1,45,325,730, 501,0,1,93,1170,4745,7515,4051,0,1,189,3913,25550, 70140,85071,37633,0,1,381,12558,124173,526050, 1077566,1053724,394353,0,1,765,39325,567210, 3482451,10718946,17386446,14196708,4596553] |