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 | 0 |
| 2 | 2 |
| 3 | 8 |
| 4 | 22 |
| 5 | 92 |
| 6 | 366 |
| 7 | 1592 |
| 8 | 6925 |
| 9 | 36101 |
| 10 | 161645 |
| 11 | 762469 |
| 12 | 3571297 |
| 13 | 16723114 |
| 14 | 78166439 |
| 15 | 365870424 |
| 16 | 1715599255 |
| 17 | 8028145462 |
| 18 | 37613414368 |
| 19 | 176081584796 |
| 20 | 824491774631 |
| 21 | 3861712572473 |
| 22 | 18083391708768 |
| 23 | 84680125527458 |
| 24 | 396550577930555 |