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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 32 |
| 5 | 430 |
| 6 | 5130 |
| 7 | 58474 |
| 8 | 651686 |
| 9 | 7178552 |
| 10 | 78592384 |
| 11 | 857649018 |
| 12 | 9342873590 |
| 13 | 101681863220 |
| 14 | 1106080305618 |
| 15 | 12028491947322 |
| 16 | 130789127977940 |
| 17 | 1421993157520604 |
| 18 | 15459828710015176 |
| 19 | 168074470099844112 |
[0,0,2,32,430,5130,58474,651686,7178552,78592384, 857649018,9342873590,101681863220,1106080305618, 12028491947322,130789127977940,1421993157520604, 15459828710015176,168074470099844112] |