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 | 2 |
| 3 | 3 |
| 4 | 10 |
| 5 | 27 |
| 6 | 98 |
| 7 | 350 |
| 8 | 1402 |
| 9 | 5743 |
| 10 | 24742 |
| 11 | 108968 |
| 12 | 492638 |
| 13 | 2266502 |
| 14 | 10600510 |
| 15 | 50235931 |
| 16 | 240882152 |
| 17 | 1166732814 |
| 18 | 5702046382 |
| 19 | 28088787314 |
| 20 | 139355139206 |
| 21 | 695808554300 |
| 22 | 3494391117164 |
| 23 | 17641695461662 |
| 24 | 89495028762682 |
| 25 | 456009893224285 |
| 26 | 2332997356507678 |
| 27 | 11980753878699716 |
| 28 | 61739654456234062 |
| 29 | 319188605907760846 |