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 | 12 |
| 2 | 86 |
| 3 | 480 |
| 4 | 2307 |
| 5 | 10044 |
| 6 | 40792 |
| 7 | 157440 |
| 8 | 584693 |
| 9 | 2107596 |
| 10 | 7420218 |
| 11 | 25634880 |
| 12 | 87207559 |
| 13 | 292924668 |
| 14 | 973531964 |
| 15 | 3206704800 |
| 16 | 10482373305 |
| 17 | 34042285260 |
| 18 | 109930177630 |
| 19 | 353238247200 |
| 20 | 1130137576331 |
| 21 | 3601849005372 |
| 22 | 11440208166816 |
| 23 | 36225346150080 |
| 24 | 114391746903037 |
| 25 | 360325587293004 |