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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 23 |
| 3 | 63 |
| 4 | 157 |
| 5 | 383 |
| 6 | 963 |
| 7 | 2551 |
| 8 | 7097 |
| 9 | 20439 |
| 10 | 60079 |
| 11 | 178511 |
| 12 | 533205 |
| 13 | 1596559 |
| 14 | 4785755 |
| 15 | 14352327 |
| 16 | 43050865 |
| 17 | 129145127 |
| 18 | 387426375 |
| 19 | 1162268383 |
| 20 | 3486792461 |
| 21 | 10460362527 |
| 22 | 31381070323 |
| 23 | 94143191063 |
| 24 | 282429550377 |
| 25 | 847288625143 |
| 26 | 2541865845983 |
| 27 | 7625597504751 |
[1,7,23,63,157,383,963,2551,7097,20439,60079, 178511,533205,1596559,4785755,14352327,43050865, 129145127,387426375,1162268383,3486792461, 10460362527,31381070323,94143191063,282429550377, 847288625143,2541865845983,7625597504751] |