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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 0 |
| 4 | 23 |
| 5 | 28 |
| 6 | 125 |
| 7 | 15 |
| 8 | 352 |
| 9 | 495 |
| 10 | 1980 |
| 11 | 97 |
| 12 | 5997 |
| 13 | 7423 |
| 14 | 31788 |
| 15 | 3517 |
| 16 | 92003 |
| 17 | 124810 |
| 18 | 500783 |
| 19 | 26040 |
| 20 | 1533923 |
| 21 | 1893482 |
| 22 | 8135999 |
| 23 | 894760 |
| 24 | 23585851 |
| 25 | 31851966 |
| 26 | 128251731 |
| 27 | 6589936 |
| 28 | 392473255 |
| 29 | 484769764 |
| 30 | 2082781221 |
| 31 | 228901799 |
| 32 | 6038019044 |
| 33 | 8154005029 |
[1,1,7,0,23,28,125,15,352,495,1980,97,5997,7423, 31788,3517,92003,124810,500783,26040,1533923, 1893482,8135999,894760,23585851,31851966, 128251731,6589936,392473255,484769764,2082781221, 228901799,6038019044,8154005029] |