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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 33 |
| 3 | 380 |
| 4 | 5510 |
| 5 | 95732 |
| 6 | 1933288 |
| 7 | 44437080 |
| 8 | 1144564278 |
| 9 | 32638644236 |
| 10 | 1020503373032 |
| 11 | 34708182795156 |
| 12 | 1275532011982176 |
| 13 | 50365443858930384 |
| 14 | 2126358227959866224 |
| 15 | 95577781657788563192 |
| 16 | 4556923094838105968302 |
[1,4,33,380,5510,95732,1933288,44437080, 1144564278,32638644236,1020503373032, 34708182795156,1275532011982176,50365443858930384, 2126358227959866224,95577781657788563192, 4556923094838105968302] |