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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 26 |
| 2 | 377 |
| 3 | 4030 |
| 4 | 35282 |
| 5 | 267020 |
| 6 | 1804855 |
| 7 | 11133278 |
| 8 | 63635364 |
| 9 | 340845830 |
| 10 | 1725623406 |
| 11 | 8314033858 |
| 12 | 38329313893 |
| 13 | 169845329890 |
| 14 | 726114272520 |
| 15 | 3004404814658 |
| 16 | 12063899757390 |
| 17 | 47120073874016 |
| 18 | 179388891204380 |
| 19 | 666854279935844 |
| 20 | 2424357631391397 |
| 21 | 8631804737992852 |
[1,26,377,4030,35282,267020,1804855,11133278, 63635364,340845830,1725623406,8314033858, 38329313893,169845329890,726114272520, 3004404814658,12063899757390,47120073874016, 179388891204380,666854279935844,2424357631391397, 8631804737992852] |