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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 3 |
| 9 | 5 |
| 10 | 16 |
| 11 | 24 |
| 12 | 90 |
| 13 | 179 |
| 14 | 567 |
| 15 | 1475 |
| 16 | 4623 |
| 17 | 13650 |
| 18 | 44475 |
| 19 | 144110 |
| 20 | 492017 |
| 21 | 1706956 |
| 22 | 6124330 |
| 23 | 22442687 |
| 24 | 84406276 |
| 25 | 324298231 |
| 26 | 1273955153 |
| 27 | 5106977701 |
| 28 | 20885538133 |
| 29 | 87046940269 |
| 30 | 369534837538 |
| 31 | 1596793560371 |
| 32 | 7019424870960 |
| 33 | 31374394197536 |
| 34 | 142514998263015 |
[1,0,0,0,0,0,1,1,3,5,16,24,90,179,567,1475,4623, 13650,44475,144110,492017,1706956,6124330, 22442687,84406276,324298231,1273955153,5106977701, 20885538133,87046940269,369534837538, 1596793560371,7019424870960,31374394197536, 142514998263015] |