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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 37 |
| 4 | 140 |
| 5 | 565 |
| 6 | 2363 |
| 7 | 10081 |
| 8 | 43804 |
| 9 | 192299 |
| 10 | 856225 |
| 11 | 3855615 |
| 12 | 17502538 |
| 13 | 79999409 |
| 14 | 367600610 |
| 15 | 1698965765 |
| 16 | 7893277598 |
| 17 | 36827039911 |
| 18 | 172440669409 |
| 19 | 809974811669 |
| 20 | 3816568822752 |
| 21 | 18036668133967 |
| 22 | 85457537179048 |
| 23 | 405802189502785 |
| 24 | 1930903706094502 |
| 25 | 9206002025583689 |
| 26 | 43974563890763465 |
[1,3,10,37,140,565,2363,10081,43804,192299,856225, 3855615,17502538,79999409,367600610,1698965765, 7893277598,36827039911,172440669409,809974811669, 3816568822752,18036668133967,85457537179048, 405802189502785,1930903706094502,9206002025583689, 43974563890763465] |