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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 51408 |
| 4 | 331072352 |
| 5 | 1080698915350 |
| 6 | 2691500727775616 |
| 7 | 5953257961411738328 |
| 8 | 12474940206857421730672 |
| 9 | 25498614004537897031551640 |
| 10 | 51527434528518884637847012176 |
| 11 | 103587934174554666918594336695328 |
| 12 | 207763415020909344351469183584249792 |
[0,1,51408,331072352,1080698915350, 2691500727775616,5953257961411738328, 12474940206857421730672, 25498614004537897031551640, 51527434528518884637847012176, 103587934174554666918594336695328, 207763415020909344351469183584249792] |