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 | 1 |
| 3 | 5 |
| 4 | 13 |
| 5 | 77 |
| 6 | 29 |
| 7 | 223 |
| 8 | 481 |
| 9 | 4609 |
| 10 | 4861 |
| 11 | 55991 |
| 12 | 58301 |
| 13 | 785633 |
| 14 | 811373 |
| 15 | 835397 |
| 16 | 1715839 |
| 17 | 29889983 |
| 18 | 10190221 |
| 19 | 197698279 |
| 20 | 40315631 |
| 21 | 13684885 |
| 22 | 13920029 |
| 23 | 325333835 |
| 24 | 990874363 |
| 25 | 25128807667 |
| 26 | 25472027467 |
| 27 | 232222818803 |
| 28 | 235091155703 |
| 29 | 6897956948587 |
| 30 | 6975593267347 |