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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 1 |
| 4 | 10 |
| 5 | 7 |
| 6 | 35 |
| 7 | 36 |
| 8 | 127 |
| 9 | 165 |
| 10 | 474 |
| 11 | 715 |
| 12 | 1807 |
| 13 | 3004 |
| 14 | 6995 |
| 15 | 12393 |
| 16 | 27370 |
| 17 | 50559 |
| 18 | 107883 |
| 19 | 204820 |
| 20 | 427351 |
| 21 | 826045 |
| 22 | 1698458 |
| 23 | 3321891 |
| 24 | 6765175 |
| 25 | 13333932 |
| 26 | 26985675 |
| 27 | 53457121 |
| 28 | 107746282 |
| 29 | 214146295 |
| 30 | 430470899 |
| 31 | 857417220 |
| 32 | 1720537327 |
[1,0,3,1,10,7,35,36,127,165,474,715,1807,3004, 6995,12393,27370,50559,107883,204820,427351, 826045,1698458,3321891,6765175,13333932,26985675, 53457121,107746282,214146295,430470899,857417220, 1720537327] |