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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 32 |
| 6 | 432 |
| 7 | 5182 |
| 8 | 58298 |
| 9 | 631576 |
| 10 | 6674138 |
| 11 | 69325782 |
| 12 | 711282602 |
| 13 | 7231989990 |
| 14 | 73034927200 |
| 15 | 733786949368 |
| 16 | 7343388325940 |
| 17 | 73265369490452 |
| 18 | 729240533644054 |
| 19 | 7244986066987314 |
| 20 | 71874101544950192 |
| 21 | 712213220743687894 |
[0,0,0,2,32,432,5182,58298,631576,6674138, 69325782,711282602,7231989990,73034927200, 733786949368,7343388325940,73265369490452, 729240533644054,7244986066987314, 71874101544950192,712213220743687894] |