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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 0 |
| 5 | 18 |
| 6 | 30 |
| 7 | 60 |
| 8 | 66 |
| 9 | 258 |
| 10 | 402 |
| 11 | 606 |
| 12 | 1266 |
| 13 | 1866 |
| 14 | 3744 |
| 15 | 6864 |
| 16 | 9648 |
| 17 | 15432 |
| 18 | 30510 |
| 19 | 41166 |
| 20 | 72342 |
| 21 | 118140 |
| 22 | 178800 |
| 23 | 266262 |
| 24 | 441462 |
| 25 | 652164 |
| 26 | 1006410 |
| 27 | 1567692 |
| 28 | 2309958 |
| 29 | 3385554 |
| 30 | 5321838 |
| 31 | 7530462 |
| 32 | 11128440 |
| 33 | 16799958 |
| 34 | 23916474 |
| 35 | 35123964 |
| 36 | 51357318 |
| 37 | 72495126 |
[1,0,0,6,0,18,30,60,66,258,402,606,1266,1866,3744, 6864,9648,15432,30510,41166,72342,118140,178800, 266262,441462,652164,1006410,1567692,2309958, 3385554,5321838,7530462,11128440,16799958, 23916474,35123964,51357318,72495126] |