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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 11 |
| 5 | 39 |
| 6 | 473 |
| 7 | 19897 |
| 8 | 63683 |
| 9 | 5731597 |
| 10 | 22926439 |
| 11 | 280212089 |
| 12 | 20175270749 |
| 13 | 224810160067 |
| 14 | 6294684482461 |
| 15 | 1321883741325001 |
| 16 | 1208579420640469 |
| 17 | 68486167169628137 |
| 18 | 17258514126746312369 |
| 19 | 178860964586279976467 |
| 20 | 6053755724458706915971 |
| 21 | 3305350625554453976644453 |
[0,0,1,11,39,473,19897,63683,5731597,22926439, 280212089,20175270749,224810160067,6294684482461, 1321883741325001,1208579420640469, 68486167169628137,17258514126746312369, 178860964586279976467,6053755724458706915971, 3305350625554453976644453] |