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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 12 |
| 6 | 15 |
| 7 | 52 |
| 8 | 57 |
| 9 | 213 |
| 10 | 218 |
| 11 | 230 |
| 12 | 854 |
| 13 | 872 |
| 14 | 933 |
| 15 | 3443 |
| 16 | 3754 |
| 17 | 3869 |
| 18 | 13758 |
| 19 | 14025 |
| 20 | 14975 |
| 21 | 15248 |
| 22 | 56644 |
| 23 | 63267 |
| 24 | 224647 |
| 25 | 241396 |
| 26 | 251385 |
| 27 | 252442 |
| 28 | 910926 |
| 29 | 977320 |
| 30 | 1028373 |
| 31 | 3635297 |
| 32 | 3988103 |
| 33 | 4146994 |
| 34 | 14507004 |
| 35 | 16053272 |
| 36 | 16164847 |
| 37 | 57613535 |
| 38 | 58303936 |
| 39 | 62515519 |
[0,1,2,3,12,15,52,57,213,218,230,854,872,933,3443, 3754,3869,13758,14025,14975,15248,56644,63267, 224647,241396,251385,252442,910926,977320,1028373, 3635297,3988103,4146994,14507004,16053272, 16164847,57613535,58303936,62515519] |