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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 3 |
| 5 | 0 |
| 6 | 10 |
| 7 | 4 |
| 8 | 31 |
| 9 | 27 |
| 10 | 97 |
| 11 | 110 |
| 12 | 291 |
| 13 | 375 |
| 14 | 802 |
| 15 | 1111 |
| 16 | 2077 |
| 17 | 2930 |
| 18 | 5034 |
| 19 | 7120 |
| 20 | 11463 |
| 21 | 16133 |
| 22 | 24737 |
| 23 | 34435 |
| 24 | 50866 |
| 25 | 69904 |
| 26 | 100123 |
| 27 | 135828 |
| 28 | 189639 |
| 29 | 253889 |
| 30 | 346959 |
| 31 | 458657 |
| 32 | 615228 |
| 33 | 803647 |
| 34 | 1060615 |
| 35 | 1369871 |
| 36 | 1782235 |
| 37 | 2277690 |
| 38 | 2925659 |
| 39 | 3702394 |
| 40 | 4701294 |
| 41 | 5894945 |
| 42 | 7408011 |
[1,0,1,0,3,0,10,4,31,27,97,110,291,375,802,1111, 2077,2930,5034,7120,11463,16133,24737,34435,50866, 69904,100123,135828,189639,253889,346959,458657, 615228,803647,1060615,1369871,1782235,2277690, 2925659,3702394,4701294,5894945,7408011] |