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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 10 |
| 6 | 78 |
| 7 | 697 |
| 8 | 10073 |
| 9 | 248734 |
| 10 | 11441903 |
| 11 | 994695397 |
| 12 | 163040832612 |
| 13 | 50170816696627 |
| 14 | 28952985431480109 |
| 15 | 31368326987104006472 |
| 16 | 63938133627255371867509 |
| 17 | 245807830666379498961633640 |
| 18 | 1787085789384745555957516856804 |
| 19 | 24634233851674722043622102881490796 |
[1,0,0,0,2,10,78,697,10073,248734,11441903, 994695397,163040832612,50170816696627, 28952985431480109,31368326987104006472, 63938133627255371867509, 245807830666379498961633640, 1787085789384745555957516856804, 24634233851674722043622102881490796] |