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 | 7 |
| 3 | 18 |
| 4 | 47 |
| 5 | 246 |
| 6 | 767 |
| 7 | 4338 |
| 8 | 13687 |
| 9 | 77766 |
| 10 | 1227617 |
| 11 | 4237966 |
| 12 | 58256487 |
| 13 | 428504938 |
| 14 | 1397827967 |
| 15 | 8041666846 |
| 16 | 127260518217 |
| 17 | 2266556004016 |
| 18 | 7867304297817 |
| 19 | 108368654581246 |
| 20 | 797215157169645 |
| 21 | 2600638713977566 |
| 22 | 34961761386236715 |
| 23 | 256768195924215394 |