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 | 3 |
| 2 | 21 |
| 3 | 145 |
| 4 | 1005 |
| 5 | 1746 |
| 6 | 5559 |
| 7 | 29005 |
| 8 | 34320 |
| 9 | 76053 |
| 10 | 146402 |
| 11 | 154269 |
| 12 | 553624 |
| 13 | 853772 |
| 14 | 853780 |
| 15 | 1841222 |
| 16 | 2582634 |
| 17 | 3051972 |
| 18 | 23630121 |
| 19 | 41571007 |
| 20 | 76908458 |
| 21 | 98649561 |
| 22 | 106586932 |
| 23 | 114021359 |
| 24 | 316366090 |
| 25 | 633141499 |