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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 8 |
| 6 | 21 |
| 7 | 30 |
| 8 | 110 |
| 9 | 304 |
| 10 | 522 |
| 11 | 1828 |
| 12 | 5188 |
| 13 | 9904 |
| 14 | 33805 |
| 15 | 97398 |
| 16 | 199382 |
| 17 | 669152 |
| 18 | 1946558 |
| 19 | 4187868 |
| 20 | 13885724 |
| 21 | 40660272 |
| 22 | 90804738 |
| 23 | 298319340 |
| 24 | 877698252 |
| 25 | 2018087328 |
| 26 | 6581773876 |
| 27 | 19433552840 |
| 28 | 45742887816 |
| 29 | 148299461600 |
| 30 | 439078448189 |
| 31 | 1053631252646 |
| 32 | 3398943033446 |
| 33 | 10085329191360 |
| 34 | 24595733167734 |
[1,0,1,2,2,8,21,30,110,304,522,1828,5188,9904, 33805,97398,199382,669152,1946558,4187868, 13885724,40660272,90804738,298319340,877698252, 2018087328,6581773876,19433552840,45742887816, 148299461600,439078448189,1053631252646, 3398943033446,10085329191360,24595733167734] |