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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 23 |
| 3 | 161 |
| 4 | 1130 |
| 5 | 7912 |
| 6 | 55384 |
| 7 | 387691 |
| 8 | 2713839 |
| 9 | 18996873 |
| 10 | 132978114 |
| 11 | 930846800 |
| 12 | 6515927600 |
| 13 | 45611493203 |
| 14 | 319280452423 |
| 15 | 2234963166961 |
| 16 | 15644742168730 |
| 17 | 109513195181112 |
| 18 | 766592366267784 |
| 19 | 5366146563874491 |
[3,23,161,1130,7912,55384,387691,2713839,18996873, 132978114,930846800,6515927600,45611493203, 319280452423,2234963166961,15644742168730, 109513195181112,766592366267784,5366146563874491] |