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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 45 |
| 4 | 197 |
| 5 | 872 |
| 6 | 3983 |
| 7 | 18439 |
| 8 | 86108 |
| 9 | 405885 |
| 10 | 1926008 |
| 11 | 9180468 |
| 12 | 43971432 |
| 13 | 211334511 |
| 14 | 1018756854 |
| 15 | 4924594051 |
| 16 | 23857317607 |
| 17 | 115808367636 |
| 18 | 563173460823 |
| 19 | 2742840860644 |
| 20 | 13377406360982 |
| 21 | 65326918131829 |
| 22 | 319371224969523 |
| 23 | 1562969595017468 |
| 24 | 7656182764050154 |
| 25 | 37535645510369349 |
| 26 | 184170600862110913 |
[1,3,11,45,197,872,3983,18439,86108,405885, 1926008,9180468,43971432,211334511,1018756854, 4924594051,23857317607,115808367636,563173460823, 2742840860644,13377406360982,65326918131829, 319371224969523,1562969595017468,7656182764050154, 37535645510369349,184170600862110913] |