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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 4 |
| 5 | 29 |
| 6 | 17 |
| 7 | 436 |
| 8 | 356 |
| 9 | 569 |
| 10 | 1847 |
| 11 | 27704 |
| 12 | 72944 |
| 13 | 1283333 |
| 14 | 726079 |
| 15 | 23833532 |
| 16 | 45232276 |
| 17 | 302068799 |
| 18 | 616565857 |
| 19 | 26369361188 |
| 20 | 23157514888 |
| 21 | 70991664061 |
| 22 | 505527042479 |
| 23 | 1150735735948 |
| 24 | 13238389944712 |
| 25 | 58668785675111 |
| 26 | 209280259070287 |
| 27 | 7809609503808088 |
| 28 | 530566746979816 |
[1,1,4,4,29,17,436,356,569,1847,27704,72944, 1283333,726079,23833532,45232276,302068799, 616565857,26369361188,23157514888,70991664061, 505527042479,1150735735948,13238389944712, 58668785675111,209280259070287,7809609503808088, 530566746979816] |