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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 13 |
| 3 | 106 |
| 4 | 1273 |
| 5 | 20226 |
| 6 | 402589 |
| 7 | 9637902 |
| 8 | 269967793 |
| 9 | 8666441650 |
| 10 | 313793596981 |
| 11 | 12653878751526 |
| 12 | 562489374836041 |
| 13 | 27328756018660266 |
| 14 | 1440892788988703821 |
| 15 | 81940739770677315646 |
| 16 | 4999648556871348611425 |
| 17 | 325806859913842861709922 |
| 18 | 22584652022005415601772645 |
[1,3,13,106,1273,20226,402589,9637902,269967793, 8666441650,313793596981,12653878751526, 562489374836041,27328756018660266, 1440892788988703821,81940739770677315646, 4999648556871348611425,325806859913842861709922, 22584652022005415601772645] |