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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 287 |
| 5 | 5496 |
| 6 | 139727 |
| 7 | 4447234 |
| 8 | 170501039 |
| 9 | 7661336692 |
| 10 | 395314147319 |
| 11 | 23054541596934 |
| 12 | 1500572569678932 |
| 13 | 107886158725753318 |
| 14 | 8494969789519239340 |
| 15 | 727287072573544716489 |
| 16 | 67284371697225428990319 |
[1,1,3,22,287,5496,139727,4447234,170501039, 7661336692,395314147319,23054541596934, 1500572569678932,107886158725753318, 8494969789519239340,727287072573544716489, 67284371697225428990319] |