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 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 37 |
| 5 | 198 |
| 6 | 1178 |
| 7 | 7548 |
| 8 | 50944 |
| 9 | 357855 |
| 10 | 2595250 |
| 11 | 19313372 |
| 12 | 146815503 |
| 13 | 1136158495 |
| 14 | 8927025989 |
| 15 | 71065654235 |
| 16 | 572215412354 |
| 17 | 4653746621835 |
| 18 | 38184724333615 |
| 19 | 315792633485360 |
| 20 | 2630183440412617 |
| 21 | 22046522161472304 |