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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 134 |
| 4 | 2232 |
| 5 | 49762 |
| 6 | 1394236 |
| 7 | 47117982 |
| 8 | 1866217296 |
| 9 | 84810000194 |
| 10 | 4350808646964 |
| 11 | 248736339576958 |
| 12 | 15682868019616408 |
| 13 | 1081153176108929250 |
| 14 | 80906410246285190508 |
| 15 | 6531880775140905838238 |
| 16 | 565912845564569155284384 |
| 17 | 52373575389612727174282882 |
[1,2,12,134,2232,49762,1394236,47117982, 1866217296,84810000194,4350808646964, 248736339576958,15682868019616408, 1081153176108929250,80906410246285190508, 6531880775140905838238,565912845564569155284384, 52373575389612727174282882] |