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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 96 |
| 3 | 2304 |
| 4 | 43972 |
| 5 | 754852 |
| 6 | 12017350 |
| 7 | 181535822 |
| 8 | 2638824216 |
| 9 | 37263580006 |
| 10 | 514648921140 |
| 11 | 6985835894832 |
| 12 | 93540620739538 |
| 13 | 1238999184320608 |
| 14 | 16269402566811754 |
| 15 | 212148448282604414 |
| 16 | 2750808905345217294 |
[4,96,2304,43972,754852,12017350,181535822, 2638824216,37263580006,514648921140,6985835894832, 93540620739538,1238999184320608,16269402566811754, 212148448282604414,2750808905345217294] |