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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 64 |
| 4 | 361 |
| 5 | 6241 |
| 6 | 35344 |
| 7 | 611524 |
| 8 | 3463321 |
| 9 | 59923081 |
| 10 | 339370084 |
| 11 | 5871850384 |
| 12 | 33254804881 |
| 13 | 575381414521 |
| 14 | 3258631508224 |
| 15 | 56381506772644 |
| 16 | 319312633001041 |
| 17 | 5524812282304561 |
| 18 | 31289379402593764 |
| 19 | 541375222159074304 |
| 20 | 3066039868821187801 |
| 21 | 53049246959306977201 |
[1,4,64,361,6241,35344,611524,3463321,59923081, 339370084,5871850384,33254804881,575381414521, 3258631508224,56381506772644,319312633001041, 5524812282304561,31289379402593764, 541375222159074304,3066039868821187801, 53049246959306977201] |