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 | 7 |
| 3 | 32 |
| 4 | 131 |
| 5 | 562 |
| 6 | 2383 |
| 7 | 10124 |
| 8 | 42916 |
| 9 | 181844 |
| 10 | 769246 |
| 11 | 3250388 |
| 12 | 13716377 |
| 13 | 57812466 |
| 14 | 243382957 |
| 15 | 1023463628 |
| 16 | 4299199426 |
| 17 | 18040918456 |
| 18 | 75632083258 |
| 19 | 316774424568 |
| 20 | 1325591467994 |
| 21 | 5542462776932 |
| 22 | 23155074355078 |
| 23 | 96661979245880 |
| 24 | 403223735948096 |
| 25 | 1680858909265768 |