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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 538 |
| 3 | 39667 |
| 4 | 1947347 |
| 5 | 95442732 |
| 6 | 4623938410 |
| 7 | 223164388883 |
| 8 | 10856162934984 |
| 9 | 528920119608746 |
| 10 | 25753779566714769 |
| 11 | 1253886238749742186 |
| 12 | 61044670504573175803 |
| 13 | 2971820260865357745857 |
| 14 | 144678418539833929320007 |
[4,538,39667,1947347,95442732,4623938410, 223164388883,10856162934984,528920119608746, 25753779566714769,1253886238749742186, 61044670504573175803,2971820260865357745857, 144678418539833929320007] |