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 | 2 |
| 2 | 11 |
| 3 | 34 |
| 4 | 183 |
| 5 | 630 |
| 6 | 3384 |
| 7 | 12192 |
| 8 | 65536 |
| 9 | 242232 |
| 10 | 1303758 |
| 11 | 4900880 |
| 12 | 26415708 |
| 13 | 100525392 |
| 14 | 542639986 |
| 15 | 2084879028 |
| 16 | 11271483340 |
| 17 | 43645729836 |
| 18 | 236329734438 |
| 19 | 921177944356 |