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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 34 |
| 3 | 526 |
| 4 | 13618 |
| 5 | 559654 |
| 6 | 35206834 |
| 7 | 3301531846 |
| 8 | 452274696418 |
| 9 | 89077635721894 |
| 10 | 24901395717678994 |
| 11 | 9775895465678639686 |
| 12 | 5341976869617159075778 |
| 13 | 4032518615672541333691174 |
| 14 | 4177918152562844767457824114 |
| 15 | 5907591811646289112930164831046 |
| 16 | 11344858065618251316427764256980898 |
[1,4,34,526,13618,559654,35206834,3301531846, 452274696418,89077635721894,24901395717678994, 9775895465678639686,5341976869617159075778, 4032518615672541333691174, 4177918152562844767457824114, 5907591811646289112930164831046, 11344858065618251316427764256980898] |