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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 16 |
| 3 | 109 |
| 4 | 855 |
| 5 | 7298 |
| 6 | 65838 |
| 7 | 617118 |
| 8 | 5946781 |
| 9 | 58506642 |
| 10 | 584894463 |
| 11 | 5921596628 |
| 12 | 60565217546 |
| 13 | 624644829720 |
| 14 | 6487216108058 |
| 15 | 67767838847144 |
| 16 | 711463437534474 |
| 17 | 7501409431304796 |
| 18 | 79386836213817417 |
| 19 | 842882477863610604 |
| 20 | 8974911258934880498 |
| 21 | 95806877080558096428 |
[1,3,16,109,855,7298,65838,617118,5946781, 58506642,584894463,5921596628,60565217546, 624644829720,6487216108058,67767838847144, 711463437534474,7501409431304796, 79386836213817417,842882477863610604, 8974911258934880498,95806877080558096428] |