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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 46 |
| 4 | 206 |
| 5 | 929 |
| 6 | 4329 |
| 7 | 20486 |
| 8 | 97355 |
| 9 | 467996 |
| 10 | 2265512 |
| 11 | 10991036 |
| 12 | 53615665 |
| 13 | 262512590 |
| 14 | 1287007951 |
| 15 | 6328945904 |
| 16 | 31190267932 |
| 17 | 153846645838 |
| 18 | 760245030978 |
| 19 | 3761932204844 |
| 20 | 18626618991331 |
| 21 | 92335790660356 |
| 22 | 458141612649416 |
| 23 | 2274161973905833 |
| 24 | 11297675206445823 |
| 25 | 56160266817847387 |
| 26 | 279261937231412016 |
[1,3,11,46,206,929,4329,20486,97355,467996, 2265512,10991036,53615665,262512590,1287007951, 6328945904,31190267932,153846645838,760245030978, 3761932204844,18626618991331,92335790660356, 458141612649416,2274161973905833, 11297675206445823,56160266817847387, 279261937231412016] |