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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 31 |
| 3 | 352 |
| 4 | 5233 |
| 5 | 95836 |
| 6 | 2080999 |
| 7 | 52189096 |
| 8 | 1482977857 |
| 9 | 47053929268 |
| 10 | 1648037039791 |
| 11 | 63125834205424 |
| 12 | 2624096058047281 |
| 13 | 117620219281363852 |
| 14 | 5653607876781921463 |
| 15 | 290035426344483253816 |
| 16 | 15814774125898034896129 |
[1,4,31,352,5233,95836,2080999,52189096, 1482977857,47053929268,1648037039791, 63125834205424,2624096058047281, 117620219281363852,5653607876781921463, 290035426344483253816,15814774125898034896129] |