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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 33 |
| 4 | 426 |
| 5 | 7670 |
| 6 | 181000 |
| 7 | 5376777 |
| 8 | 195238792 |
| 9 | 8472419484 |
| 10 | 431606519268 |
| 11 | 25440239275308 |
| 12 | 1714357181128372 |
| 13 | 130748750027622922 |
| 14 | 11188498960336877296 |
| 15 | 1066226987215138587095 |
| 16 | 112415085220156146401380 |
| 17 | 13037223283297354475403696 |
[1,1,4,33,426,7670,181000,5376777,195238792, 8472419484,431606519268,25440239275308, 1714357181128372,130748750027622922, 11188498960336877296,1066226987215138587095, 112415085220156146401380, 13037223283297354475403696] |