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 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 11 |
| 5 | 51 |
| 6 | 162 |
| 7 | 876 |
| 8 | 3761 |
| 9 | 20782 |
| 10 | 109293 |
| 11 | 678569 |
| 12 | 4038388 |
| 13 | 27644436 |
| 14 | 186524145 |
| 15 | 1379760895 |
| 16 | 10323844183 |
| 17 | 82864869803 |
| 18 | 674798169662 |
| 19 | 5832742205056 |
| 20 | 51385856585637 |
| 21 | 474708148273586 |
| 22 | 4486977535287371 |
| 23 | 44152005855084345 |
| 24 | 444577220573083896 |