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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 3 |
| 9 | 7 |
| 10 | 4 |
| 11 | 0 |
| 12 | 12 |
| 13 | 45 |
| 14 | 55 |
| 15 | 22 |
| 16 | 55 |
| 17 | 286 |
| 18 | 546 |
| 19 | 455 |
| 20 | 413 |
| 21 | 1820 |
| 22 | 4760 |
| 23 | 6120 |
| 24 | 5304 |
| 25 | 12597 |
| 26 | 38760 |
| 27 | 67830 |
| 28 | 73587 |
| 29 | 108262 |
| 30 | 309925 |
| 31 | 672980 |
| 32 | 928763 |
| 33 | 1171390 |
| 34 | 2598310 |
| 35 | 6270030 |
| 36 | 10607025 |
| 37 | 14033565 |
| 38 | 24293880 |
| 39 | 57256875 |
| 40 | 112293597 |
| 41 | 167416275 |
| 42 | 255805056 |
[1,0,0,0,1,1,0,0,3,7,4,0,12,45,55,22,55,286,546, 455,413,1820,4760,6120,5304,12597,38760,67830, 73587,108262,309925,672980,928763,1171390,2598310, 6270030,10607025,14033565,24293880,57256875, 112293597,167416275,255805056] |