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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 1 |
| 17 | 355687428096000 |
| 18 | 3237415247416050491577971184000 |
| 19 | 13564406360915457771720399143711430952267776000 |
| 20 | 37911589613425952733393718264069147678877877626169022024515000 |
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 355687428096000,3237415247416050491577971184000, 13564406360915457771720399143711430952267776000, 37911589613425952733393718264069147678877877626169\ 022024515000] |