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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 512 |
| 4 | 11232 |
| 5 | 145920 |
| 6 | 1055616 |
| 7 | 5618688 |
| 8 | 25330128 |
| 9 | 89127936 |
| 10 | 295067136 |
| 11 | 810542592 |
| 12 | 2185379968 |
| 13 | 5109275136 |
| 14 | 11899724544 |
| 15 | 24646120448 |
| 16 | 51701896272 |
| 17 | 97674279936 |
| 18 | 188911940608 |
| 19 | 331864693248 |
| 20 | 602050989120 |
| 21 | 997987350528 |
| 22 | 1717717782144 |
| 23 | 2714582258688 |
[1,0,0,512,11232,145920,1055616,5618688,25330128, 89127936,295067136,810542592,2185379968, 5109275136,11899724544,24646120448,51701896272, 97674279936,188911940608,331864693248, 602050989120,997987350528,1717717782144, 2714582258688] |