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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 44 |
| 3 | 764 |
| 4 | 18204 |
| 5 | 551644 |
| 6 | 20291804 |
| 7 | 877970524 |
| 8 | 43680345564 |
| 9 | 2456429581404 |
| 10 | 154072160204764 |
| 11 | 10663000409493084 |
| 12 | 807124301044917724 |
| 13 | 66329628496719183964 |
| 14 | 5881222650127663682524 |
| 15 | 559616682597652939940444 |
| 16 | 56879286407092006924382684 |
[1,4,44,764,18204,551644,20291804,877970524, 43680345564,2456429581404,154072160204764, 10663000409493084,807124301044917724, 66329628496719183964,5881222650127663682524, 559616682597652939940444, 56879286407092006924382684] |