This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 25 |
| 3 | 73 |
| 4 | 193 |
| 5 | 481 |
| 6 | 1153 |
| 7 | 2689 |
| 8 | 6145 |
| 9 | 13825 |
| 10 | 30721 |
| 11 | 67585 |
| 12 | 147457 |
| 13 | 319489 |
| 14 | 688129 |
| 15 | 1474561 |
| 16 | 3145729 |
| 17 | 6684673 |
| 18 | 14155777 |
| 19 | 29884417 |
| 20 | 62914561 |
| 21 | 132120577 |
| 22 | 276824065 |
| 23 | 578813953 |
| 24 | 1207959553 |
| 25 | 2516582401 |
| 26 | 5234491393 |
| 27 | 10871635969 |
| 28 | 22548578305 |
| 29 | 46707769345 |