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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 43 |
| 7 | 127 |
| 8 | 544 |
| 9 | 2361 |
| 10 | 11703 |
| 11 | 61690 |
| 12 | 351773 |
| 13 | 2126497 |
| 14 | 13639372 |
| 15 | 92197523 |
| 16 | 655035769 |
| 17 | 4874404108 |
| 18 | 37893370473 |
| 19 | 306986431847 |
| 20 | 2586209749712 |
| 21 | 22612848403571 |
| 22 | 204850732480285 |
| 23 | 1919652428481930 |
| 24 | 18581619724363401 |
| 25 | 185543613289200949 |