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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 37 |
| 4 | 169 |
| 5 | 764 |
| 6 | 3570 |
| 7 | 16703 |
| 8 | 79241 |
| 9 | 376798 |
| 10 | 1805142 |
| 11 | 8665465 |
| 12 | 41789096 |
| 13 | 201875936 |
| 14 | 978179193 |
| 15 | 4746784129 |
| 16 | 23083338726 |
| 17 | 112396493348 |
| 18 | 548133058539 |
| 19 | 2676039172518 |
| 20 | 13080534402875 |
| 21 | 63997396326343 |
| 22 | 313416940914396 |
| 23 | 1536133931051434 |
| 24 | 7535038583429033 |
| 25 | 36986339951436139 |
| 26 | 181673837189597527 |
[1,2,9,37,169,764,3570,16703,79241,376798,1805142, 8665465,41789096,201875936,978179193,4746784129, 23083338726,112396493348,548133058539, 2676039172518,13080534402875,63997396326343, 313416940914396,1536133931051434,7535038583429033, 36986339951436139,181673837189597527] |