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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 44 |
| 3 | 496 |
| 4 | 2862 |
| 5 | 23678 |
| 6 | 195968 |
| 7 | 1802656 |
| 8 | 17117005 |
| 9 | 168709746 |
| 10 | 1694684254 |
| 11 | 17289573440 |
| 12 | 178062468561 |
| 13 | 1845566511698 |
| 14 | 19219604394050 |
| 15 | 200763478955510 |
| 16 | 2102763177782278 |
| 17 | 22063214171071906 |
| 18 | 231903259943200754 |
[0,44,496,2862,23678,195968,1802656,17117005, 168709746,1694684254,17289573440,178062468561, 1845566511698,19219604394050,200763478955510, 2102763177782278,22063214171071906, 231903259943200754] |