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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 2 |
| 12 | 6 |
| 13 | 16 |
| 14 | 36 |
| 15 | 71 |
| 16 | 126 |
| 17 | 204 |
| 18 | 303 |
| 19 | 414 |
| 20 | 526 |
| 21 | 652 |
| 22 | 907 |
| 23 | 1705 |
| 24 | 4213 |
| 25 | 11329 |
| 26 | 29670 |
| 27 | 73408 |
| 28 | 171345 |
| 29 | 379494 |
| 30 | 802875 |
| 31 | 1632745 |
| 32 | 3210086 |
| 33 | 6134908 |
| 34 | 11457641 |
| 35 | 21020580 |
| 36 | 38076142 |
[0,0,0,0,0,1,1,1,1,1,2,6,16,36,71,126,204,303,414, 526,652,907,1705,4213,11329,29670,73408,171345, 379494,802875,1632745,3210086,6134908,11457641, 21020580,38076142] |