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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 39 |
| 4 | 827 |
| 5 | 34380 |
| 6 | 2473197 |
| 7 | 275864757 |
| 8 | 44025149100 |
| 9 | 9497957945859 |
| 10 | 2658392388727335 |
| 11 | 935814016563467580 |
| 12 | 404396026663235193369 |
| 13 | 210377008332888349156425 |
| 14 | 129655968695522299896282900 |
| 15 | 93400142845800651895616978655 |
| 16 | 77748684005223840073739923036755 |
[1,1,4,39,827,34380,2473197,275864757,44025149100, 9497957945859,2658392388727335,935814016563467580, 404396026663235193369,210377008332888349156425, 129655968695522299896282900, 93400142845800651895616978655, 77748684005223840073739923036755] |