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) |
|---|---|
| 1 | 25 |
| 2 | 139 |
| 3 | 240 |
| 4 | 455 |
| 5 | 1072 |
| 6 | 2718 |
| 7 | 5637 |
| 8 | 12823 |
| 9 | 30486 |
| 10 | 72042 |
| 11 | 166884 |
| 12 | 390514 |
| 13 | 917562 |
| 14 | 2167323 |
| 15 | 5114140 |
| 16 | 12071815 |
| 17 | 28523614 |
| 18 | 67538866 |
| 19 | 159964100 |
| 20 | 378996636 |
| 21 | 898240293 |
| 22 | 2130429190 |
| 23 | 5054033816 |
| 24 | 11993264778 |
| 25 | 28464315995 |
| 26 | 67574829560 |