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 | 7 |
| 3 | 31 |
| 4 | 265 |
| 5 | 1177 |
| 6 | 10063 |
| 7 | 44695 |
| 8 | 382129 |
| 9 | 1697233 |
| 10 | 14510839 |
| 11 | 64450159 |
| 12 | 551029753 |
| 13 | 2447408809 |
| 14 | 20924619775 |
| 15 | 92937084583 |
| 16 | 794584521697 |
| 17 | 3529161805345 |
| 18 | 30173287204711 |
| 19 | 134015211518527 |
| 20 | 1145790329257321 |
| 21 | 5089048875898681 |
| 22 | 43509859224573487 |