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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 36 |
| 3 | 444 |
| 4 | 6636 |
| 5 | 114084 |
| 6 | 2194596 |
| 7 | 46460124 |
| 8 | 1070653356 |
| 9 | 26650132164 |
| 10 | 712373143716 |
| 11 | 20355134459004 |
| 12 | 619356569885676 |
| 13 | 20002325474150244 |
| 14 | 683641504802995236 |
| 15 | 24662695086736585884 |
| 16 | 936845038595867508396 |
| 17 | 37388655553571504769924 |
| 18 | 1564425694139017014501156 |
[1,4,36,444,6636,114084,2194596,46460124, 1070653356,26650132164,712373143716, 20355134459004,619356569885676,20002325474150244, 683641504802995236,24662695086736585884, 936845038595867508396,37388655553571504769924, 1564425694139017014501156] |