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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 4 |
| 8 | 11 |
| 9 | 14 |
| 10 | 29 |
| 11 | 66 |
| 12 | 115 |
| 13 | 222 |
| 14 | 493 |
| 15 | 944 |
| 16 | 1884 |
| 17 | 4020 |
| 18 | 8175 |
| 19 | 16618 |
| 20 | 35198 |
| 21 | 73220 |
| 22 | 151844 |
| 23 | 321036 |
| 24 | 676778 |
| 25 | 1421828 |
| 26 | 3016813 |
| 27 | 6407344 |
| 28 | 13589888 |
| 29 | 28962702 |
| 30 | 61853827 |
| 31 | 132073646 |
| 32 | 282752030 |
| 33 | 606492428 |
| 34 | 1301587833 |
| 35 | 2797816706 |
| 36 | 6023460551 |
| 37 | 12978238202 |
| 38 | 27995493484 |
[1,1,0,1,2,2,4,11,14,29,66,115,222,493,944,1884, 4020,8175,16618,35198,73220,151844,321036,676778, 1421828,3016813,6407344,13589888,28962702, 61853827,132073646,282752030,606492428,1301587833, 2797816706,6023460551,12978238202,27995493484] |