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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 41 |
| 5 | 155 |
| 6 | 603 |
| 7 | 2361 |
| 8 | 9321 |
| 9 | 37015 |
| 10 | 147657 |
| 11 | 591227 |
| 12 | 2374539 |
| 13 | 9561487 |
| 14 | 38585555 |
| 15 | 156007667 |
| 16 | 631806555 |
| 17 | 2562434223 |
| 18 | 10405918209 |
| 19 | 42306525037 |
| 20 | 172180092143 |
| 21 | 701397054549 |
| 22 | 2859651782649 |
| 23 | 11668050956347 |
| 24 | 47642140547239 |
| 25 | 194655761552949 |
| 26 | 795800965884627 |
[1,3,11,41,155,603,2361,9321,37015,147657,591227, 2374539,9561487,38585555,156007667,631806555, 2562434223,10405918209,42306525037,172180092143, 701397054549,2859651782649,11668050956347, 47642140547239,194655761552949,795800965884627] |