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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 24 |
| 3 | 171 |
| 4 | 1335 |
| 5 | 11940 |
| 6 | 115773 |
| 7 | 1160901 |
| 8 | 11901537 |
| 9 | 124726644 |
| 10 | 1332688035 |
| 11 | 14455451526 |
| 12 | 158660036535 |
| 13 | 1758835084221 |
| 14 | 19667067522966 |
| 15 | 221573079684087 |
| 16 | 2512635069594897 |
| 17 | 28656903391830291 |
| 18 | 328500210705228867 |
| 19 | 3782806859877522522 |
| 20 | 43738575934977450465 |
[1,3,24,171,1335,11940,115773,1160901,11901537, 124726644,1332688035,14455451526,158660036535, 1758835084221,19667067522966,221573079684087, 2512635069594897,28656903391830291, 328500210705228867,3782806859877522522, 43738575934977450465] |