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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 196 |
| 3 | 26244 |
| 4 | 1993744 |
| 5 | 141086884 |
| 6 | 10808097444 |
| 7 | 831331827076 |
| 8 | 63322713408249 |
| 9 | 4821670840815504 |
| 10 | 367536797553489424 |
| 11 | 28019444925515784976 |
| 12 | 2135875239154027938961 |
| 13 | 162806957002649300388100 |
[4,196,26244,1993744,141086884,10808097444, 831331827076,63322713408249,4821670840815504, 367536797553489424,28019444925515784976, 2135875239154027938961,162806957002649300388100] |