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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 41 |
| 5 | 165 |
| 6 | 694 |
| 7 | 2988 |
| 8 | 13193 |
| 9 | 59066 |
| 10 | 268379 |
| 11 | 1231626 |
| 12 | 5704380 |
| 13 | 26611742 |
| 14 | 124914243 |
| 15 | 589486310 |
| 16 | 2794536997 |
| 17 | 13300945698 |
| 18 | 63527577649 |
| 19 | 304353789667 |
| 20 | 1462105314004 |
| 21 | 7041034245378 |
| 22 | 33981505377177 |
| 23 | 164324765870646 |
| 24 | 796043522013364 |
| 25 | 3862540751165703 |
| 26 | 18769384408722165 |
| 27 | 91329911356977127 |
[1,1,3,11,41,165,694,2988,13193,59066,268379, 1231626,5704380,26611742,124914243,589486310, 2794536997,13300945698,63527577649,304353789667, 1462105314004,7041034245378,33981505377177, 164324765870646,796043522013364,3862540751165703, 18769384408722165,91329911356977127] |