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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 8 |
| 6 | 40 |
| 7 | 211 |
| 8 | 1406 |
| 9 | 9754 |
| 10 | 71591 |
| 11 | 537699 |
| 12 | 4131943 |
| 13 | 32271490 |
| 14 | 255690412 |
| 15 | 2050376883 |
| 16 | 16616721067 |
| 17 | 135920429975 |
| 18 | 1120999363012 |
| 19 | 9313779465810 |
| 20 | 77897862860818 |
| 21 | 655433405297407 |
| 22 | 5544948758579214 |
| 23 | 47143948331898873 |
| 24 | 402655164736641843 |
| 25 | 3453509765971944236 |
| 26 | 29734988097830504532 |