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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 490770 |
| 5 | 25510464 |
| 6 | 680279040 |
| 7 | 10924246080 |
| 8 | 120784075020 |
| 9 | 1006463391360 |
| 10 | 6705022657536 |
| 11 | 37283543136000 |
| 12 | 178519518847530 |
| 13 | 754021089521280 |
| 14 | 2862533247114240 |
| 15 | 9909872660858688 |
| 16 | 31663678300510410 |
[1,0,0,0,490770,25510464,680279040,10924246080, 120784075020,1006463391360,6705022657536, 37283543136000,178519518847530,754021089521280, 2862533247114240,9909872660858688, 31663678300510410] |