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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 3 |
| 10 | 8 |
| 11 | 20 |
| 12 | 51 |
| 13 | 114 |
| 14 | 262 |
| 15 | 572 |
| 16 | 1238 |
| 17 | 2603 |
| 18 | 5435 |
| 19 | 11114 |
| 20 | 22539 |
| 21 | 45018 |
| 22 | 89119 |
| 23 | 174435 |
| 24 | 338651 |
| 25 | 651073 |
| 26 | 1242310 |
| 27 | 2351079 |
| 28 | 4418372 |
| 29 | 8243887 |
| 30 | 15283377 |
| 31 | 28151746 |
| 32 | 51549950 |
| 33 | 93846286 |
| 34 | 169917456 |
| 35 | 306013788 |
| 36 | 548341288 |
| 37 | 977736530 |
| 38 | 1735212109 |
| 39 | 3065483507 |
[1,0,0,0,0,0,0,0,1,3,8,20,51,114,262,572,1238, 2603,5435,11114,22539,45018,89119,174435,338651, 651073,1242310,2351079,4418372,8243887,15283377, 28151746,51549950,93846286,169917456,306013788, 548341288,977736530,1735212109,3065483507] |