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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 9800 |
| 3 | 0 |
| 4 | 16013200 |
| 5 | 0 |
| 6 | 10479036120 |
| 7 | 0 |
| 8 | 3681129969440 |
| 9 | 0 |
| 10 | 806898799084392 |
| 11 | 0 |
| 12 | 121032811973584560 |
| 13 | 0 |
| 14 | 13225339591553573880 |
| 15 | 0 |
| 16 | 1101592116648629874240 |
| 17 | 0 |
| 18 | 72393605649421626732680 |
| 19 | 0 |
| 20 | 3856647616141475449361872 |
| 21 | 0 |
| 22 | 170239941030636357079306520 |
| 23 | 0 |
| 24 | 6340353831737951399852254560 |
| 25 | 0 |
[1,0,9800,0,16013200,0,10479036120,0, 3681129969440,0,806898799084392,0, 121032811973584560,0,13225339591553573880,0, 1101592116648629874240,0,72393605649421626732680, 0,3856647616141475449361872,0, 170239941030636357079306520,0, 6340353831737951399852254560,0] |