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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 57 |
| 3 | 116 |
| 4 | 3305 |
| 5 | 6726 |
| 6 | 191633 |
| 7 | 389992 |
| 8 | 11111409 |
| 9 | 22612810 |
| 10 | 644270089 |
| 11 | 1311152988 |
| 12 | 37356553753 |
| 13 | 76024260494 |
| 14 | 2166035847585 |
| 15 | 4408095955664 |
| 16 | 125592722606177 |
| 17 | 255593541168018 |
| 18 | 7282211875310681 |
| 19 | 14820017291789380 |
| 20 | 422242696045413321 |
[1,2,57,116,3305,6726,191633,389992,11111409, 22612810,644270089,1311152988,37356553753, 76024260494,2166035847585,4408095955664, 125592722606177,255593541168018,7282211875310681, 14820017291789380,422242696045413321] |