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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 5 |
| 6 | 6 |
| 7 | 27 |
| 8 | 53 |
| 9 | 140 |
| 10 | 649 |
| 11 | 1297 |
| 12 | 6355 |
| 13 | 18038 |
| 14 | 63226 |
| 15 | 241741 |
| 16 | 744711 |
| 17 | 3008107 |
| 18 | 10028056 |
| 19 | 37270169 |
| 20 | 138083464 |
| 21 | 488933323 |
| 22 | 1872525356 |
| 23 | 6763888465 |
| 24 | 25498771059 |
| 25 | 95467533318 |
| 26 | 355595703773 |
| 27 | 1353873044078 |
| 28 | 5077809606803 |
| 29 | 19345857682140 |
| 30 | 73533468653115 |