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 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 23 |
| 4 | 102 |
| 5 | 443 |
| 6 | 1898 |
| 7 | 8054 |
| 8 | 33932 |
| 9 | 142163 |
| 10 | 592962 |
| 11 | 2464226 |
| 12 | 10209620 |
| 13 | 42190558 |
| 14 | 173962532 |
| 15 | 715908428 |
| 16 | 2941192472 |
| 17 | 12065310083 |
| 18 | 49428043442 |
| 19 | 202249741418 |
| 20 | 826671597572 |
| 21 | 3375609654698 |
| 22 | 13771567556012 |
| 23 | 56138319705908 |
| 24 | 228669994187432 |
| 25 | 930803778591278 |