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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 16 |
| 4 | 232 |
| 5 | 3328 |
| 6 | 47956 |
| 7 | 696256 |
| 8 | 10185824 |
| 9 | 150050816 |
| 10 | 2224086242 |
| 11 | 33144506016 |
| 12 | 496287233040 |
| 13 | 7462288270848 |
| 14 | 112621324354952 |
| 15 | 1705306407267200 |
| 16 | 25898042412463808 |
| 17 | 394353145059565568 |
[0,0,1,16,232,3328,47956,696256,10185824, 150050816,2224086242,33144506016,496287233040, 7462288270848,112621324354952,1705306407267200, 25898042412463808,394353145059565568] |