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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 38 |
| 3 | 604 |
| 4 | 13797 |
| 5 | 416168 |
| 6 | 15711490 |
| 7 | 715565508 |
| 8 | 38278167466 |
| 9 | 2356801113088 |
| 10 | 164391501446500 |
| 11 | 12826066272723832 |
| 12 | 1107734575497955773 |
| 13 | 104985517080964044744 |
| 14 | 10838759916371136482170 |
| 15 | 1211294776167588947134004 |
| 16 | 145737426974188872882131694 |
[1,4,38,604,13797,416168,15711490,715565508, 38278167466,2356801113088,164391501446500, 12826066272723832,1107734575497955773, 104985517080964044744,10838759916371136482170, 1211294776167588947134004, 145737426974188872882131694] |