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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 5 |
| 4 | 60 |
| 5 | 876 |
| 6 | 15820 |
| 7 | 342490 |
| 8 | 8659697 |
| 9 | 250596841 |
| 10 | 8170355939 |
| 11 | 296392500231 |
| 12 | 11842341000706 |
| 13 | 516766134975841 |
| 14 | 24454542316972336 |
| 15 | 1247414741568401188 |
| 16 | 68231675778495540368 |
| 17 | 3983959314088980184276 |
| 18 | 247324089280835008754847 |
[0,0,5,60,876,15820,342490,8659697,250596841, 8170355939,296392500231,11842341000706, 516766134975841,24454542316972336, 1247414741568401188,68231675778495540368, 3983959314088980184276,247324089280835008754847] |