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 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 29 |
| 4 | 130 |
| 5 | 561 |
| 6 | 2366 |
| 7 | 9829 |
| 8 | 40410 |
| 9 | 164921 |
| 10 | 669526 |
| 11 | 2707629 |
| 12 | 10919090 |
| 13 | 43942081 |
| 14 | 176565486 |
| 15 | 708653429 |
| 16 | 2841788170 |
| 17 | 11388676041 |
| 18 | 45619274246 |
| 19 | 182670807229 |
| 20 | 731264359650 |
| 21 | 2926800830801 |
| 22 | 11712433499806 |
| 23 | 46865424529029 |
| 24 | 187508769705530 |
| 25 | 750176293590361 |
| 26 | 3001128818666166 |