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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 51 |
| 5 | 179 |
| 6 | 707 |
| 7 | 2631 |
| 8 | 10657 |
| 9 | 41565 |
| 10 | 169377 |
| 11 | 678979 |
| 12 | 2805783 |
| 13 | 11404107 |
| 14 | 47516901 |
| 15 | 195827851 |
| 16 | 820726217 |
| 17 | 3412550073 |
| 18 | 14390982059 |
| 19 | 60257900655 |
| 20 | 255171625883 |
| 21 | 1075127342833 |
| 22 | 4570044063309 |
| 23 | 19344638669811 |
| 24 | 82504699986853 |
| 25 | 350671396291897 |
| 26 | 1499645586308341 |
| 27 | 6396288907426213 |
[1,1,5,13,51,179,707,2631,10657,41565,169377, 678979,2805783,11404107,47516901,195827851, 820726217,3412550073,14390982059,60257900655, 255171625883,1075127342833,4570044063309, 19344638669811,82504699986853,350671396291897, 1499645586308341,6396288907426213] |