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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 26 |
| 4 | 1 |
| 5 | 237 |
| 6 | 1 |
| 7 | 18 |
| 8 | 2789 |
| 9 | 31 |
| 10 | 135 |
| 11 | 170 |
| 12 | 40270 |
| 13 | 386 |
| 14 | 810 |
| 15 | 3060 |
| 16 | 2130 |
| 17 | 689450 |
| 18 | 6574 |
| 19 | 13545 |
| 20 | 36295 |
| 21 | 44730 |
| 22 | 32949 |
| 23 | 13657756 |
| 24 | 129291 |
| 25 | 327285 |
| 26 | 323680 |
| 27 | 944300 |
| 28 | 790776 |
| 29 | 604128 |
| 30 | 307348641 |
| 31 | 2910709 |
| 32 | 7207137 |
| 33 | 6602120 |
| 34 | 15476580 |
| 35 | 18780930 |
| 36 | 16311456 |
| 37 | 12782916 |
[1,1,4,26,1,237,1,18,2789,31,135,170,40270,386, 810,3060,2130,689450,6574,13545,36295,44730,32949, 13657756,129291,327285,323680,944300,790776, 604128,307348641,2910709,7207137,6602120,15476580, 18780930,16311456,12782916] |