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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 924 |
| 2 | 117084 |
| 3 | 4812192 |
| 4 | 86075484 |
| 5 | 815677016 |
| 6 | 5012882336 |
| 7 | 23460347328 |
| 8 | 89096422492 |
| 9 | 289559673084 |
| 10 | 830202403800 |
| 11 | 2153312518240 |
| 12 | 5140361517984 |
| 13 | 11444537517336 |
| 14 | 24015334687168 |
| 15 | 47873378766400 |
| 16 | 91281903219804 |
| 17 | 167369436673208 |
| 18 | 296418599695548 |
| 19 | 509007239863584 |
[1,924,117084,4812192,86075484,815677016, 5012882336,23460347328,89096422492,289559673084, 830202403800,2153312518240,5140361517984, 11444537517336,24015334687168,47873378766400, 91281903219804,167369436673208,296418599695548, 509007239863584] |