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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 44 |
| 3 | 369 |
| 4 | 3633 |
| 5 | 34002 |
| 6 | 323293 |
| 7 | 3058623 |
| 8 | 28982628 |
| 9 | 274494621 |
| 10 | 2600148629 |
| 11 | 24628666626 |
| 12 | 233286962601 |
| 13 | 2209723174731 |
| 14 | 20930806288252 |
| 15 | 198259418947833 |
| 16 | 1877940242218857 |
| 17 | 17788105074906162 |
| 18 | 168491350295593637 |
| 19 | 1595972975308532199 |
| 20 | 15117273008425964916 |
[1,3,44,369,3633,34002,323293,3058623,28982628, 274494621,2600148629,24628666626,233286962601, 2209723174731,20930806288252,198259418947833, 1877940242218857,17788105074906162, 168491350295593637,1595972975308532199, 15117273008425964916] |