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 | 23 |
| 2 | 299 |
| 3 | 2852 |
| 4 | 22126 |
| 5 | 147407 |
| 6 | 871838 |
| 7 | 4680845 |
| 8 | 23177583 |
| 9 | 107100903 |
| 10 | 466066181 |
| 11 | 1923780950 |
| 12 | 7576060505 |
| 13 | 28601630657 |
| 14 | 103928814438 |
| 15 | 364712523658 |
| 16 | 1239637963457 |
| 17 | 4091266414235 |
| 18 | 13139808783725 |
| 19 | 41145568478988 |
| 20 | 125833948024603 |
| 21 | 376417734772625 |
| 22 | 1102878148698235 |