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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 41 |
| 3 | 3127 |
| 4 | 41813 |
| 5 | 1269900 |
| 6 | 45832761 |
| 7 | 1064557805 |
| 8 | 30860212081 |
| 9 | 928789262080 |
| 10 | 25020222581494 |
| 11 | 714819627084057 |
| 12 | 20574308184277971 |
| 13 | 576115800837801057 |
| 14 | 16381774291037991059 |
| 15 | 466431115279461257920 |
| 16 | 13190758349044182698371 |
| 17 | 374524994697062170913555 |
[1,1,41,3127,41813,1269900,45832761,1064557805, 30860212081,928789262080,25020222581494, 714819627084057,20574308184277971, 576115800837801057,16381774291037991059, 466431115279461257920,13190758349044182698371, 374524994697062170913555] |