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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 47 |
| 4 | 199 |
| 5 | 887 |
| 6 | 4007 |
| 7 | 18295 |
| 8 | 84839 |
| 9 | 395159 |
| 10 | 1856407 |
| 11 | 8766263 |
| 12 | 41568295 |
| 13 | 198016663 |
| 14 | 946007351 |
| 15 | 4533908791 |
| 16 | 21785184967 |
| 17 | 104907997079 |
| 18 | 506278355543 |
| 19 | 2447542855991 |
| 20 | 11852361301607 |
| 21 | 57481586054295 |
| 22 | 279149979077495 |
| 23 | 1357365314039095 |
| 24 | 6607645519512583 |
| 25 | 32200121570335895 |
| 26 | 157069431636977815 |
[1,3,11,47,199,887,4007,18295,84839,395159, 1856407,8766263,41568295,198016663,946007351, 4533908791,21785184967,104907997079,506278355543, 2447542855991,11852361301607,57481586054295, 279149979077495,1357365314039095,6607645519512583, 32200121570335895,157069431636977815] |