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 | 1 |
| 2 | 16 |
| 3 | 97 |
| 4 | 457 |
| 5 | 2297 |
| 6 | 11113 |
| 7 | 52049 |
| 8 | 235334 |
| 9 | 1039886 |
| 10 | 4497930 |
| 11 | 19074006 |
| 12 | 79418883 |
| 13 | 325184763 |
| 14 | 1311252535 |
| 15 | 5212704708 |
| 16 | 20449320159 |
| 17 | 79231806015 |
| 18 | 303428397505 |
| 19 | 1149325838320 |
| 20 | 4308477305997 |
| 21 | 15993198330782 |
| 22 | 58815616643170 |
| 23 | 214383601754107 |
| 24 | 774837953045873 |