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 | 4 |
| 4 | 10 |
| 5 | 27 |
| 6 | 79 |
| 7 | 240 |
| 8 | 750 |
| 9 | 2387 |
| 10 | 7711 |
| 11 | 25214 |
| 12 | 83315 |
| 13 | 277799 |
| 14 | 933596 |
| 15 | 3159187 |
| 16 | 10755190 |
| 17 | 36811479 |
| 18 | 126594819 |
| 19 | 437220744 |
| 20 | 1515844359 |
| 21 | 5273760446 |
| 22 | 18406122609 |
| 23 | 64426136558 |
| 24 | 226108087891 |
| 25 | 795486834627 |
| 26 | 2804993559426 |
| 27 | 9911529800630 |
| 28 | 35090946422404 |
| 29 | 124462137097349 |