The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 1 |
| 7 | 4 |
| 8 | 11 |
| 9 | 5 |
| 10 | 16 |
| 11 | 41 |
| 12 | 22 |
| 13 | 63 |
| 14 | 155 |
| 15 | 92 |
| 16 | 247 |
| 17 | 591 |
| 18 | 376 |
| 19 | 967 |
| 20 | 2267 |
| 21 | 1518 |
| 22 | 3785 |
| 23 | 8735 |
| 24 | 6085 |
| 25 | 14820 |
| 26 | 33775 |
| 27 | 24285 |
| 28 | 58060 |
| 29 | 130965 |
| 30 | 96647 |
| 31 | 227612 |
| 32 | 509015 |
| 33 | 383911 |
| 34 | 892926 |
| 35 | 1982269 |
| 36 | 1523117 |
| 37 | 3505386 |
| 38 | 7732659 |
| 39 | 6037745 |
| 40 | 13770404 |
| 41 | 30208749 |
[0,0,1,0,1,3,1,4,11,5,16,41,22,63,155,92,247,591, 376,967,2267,1518,3785,8735,6085,14820,33775, 24285,58060,130965,96647,227612,509015,383911, 892926,1982269,1523117,3505386,7732659,6037745, 13770404,30208749] |