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 | 5 |
| 2 | 25 |
| 3 | 130 |
| 4 | 650 |
| 5 | 2942 |
| 6 | 11819 |
| 7 | 42305 |
| 8 | 136564 |
| 9 | 402910 |
| 10 | 1099694 |
| 11 | 2805530 |
| 12 | 6748066 |
| 13 | 15412437 |
| 14 | 33626131 |
| 15 | 70430778 |
| 16 | 142218719 |
| 17 | 277853339 |
| 18 | 526833235 |
| 19 | 972034814 |
| 20 | 1749218190 |
| 21 | 3076360192 |
| 22 | 5297051455 |
| 23 | 8943742419 |
| 24 | 14828643610 |
| 25 | 24172697276 |