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A048509 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 26 |
| 2 | 87 |
| 3 | 233 |
| 4 | 577 |
| 5 | 1377 |
| 6 | 3217 |
| 7 | 7409 |
| 8 | 16881 |
| 9 | 38129 |
| 10 | 85489 |
| 11 | 190449 |
| 12 | 421873 |
| 13 | 929777 |
| 14 | 2039793 |
| 15 | 4456433 |
| 16 | 9699313 |
| 17 | 21037041 |
| 18 | 45481969 |
| 19 | 98041841 |
| 20 | 210763761 |
| 21 | 451936241 |
| 22 | 966787057 |
| 23 | 2063597553 |
| 24 | 4395630577 |
| 25 | 9344909297 |
| 26 | 19830669297 |
| 27 | 42010148849 |
| 28 | 88852135921 |
[1,26,87,233,577,1377,3217,7409,16881,38129,85489, 190449,421873,929777,2039793,4456433,9699313, 21037041,45481969,98041841,210763761,451936241, 966787057,2063597553,4395630577,9344909297, 19830669297,42010148849,88852135921] |