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 | 7 |
| 1 | 15 |
| 2 | 37 |
| 3 | 89 |
| 4 | 1283 |
| 5 | 2655 |
| 6 | 6593 |
| 7 | 15841 |
| 8 | 228367 |
| 9 | 472575 |
| 10 | 1173517 |
| 11 | 2819609 |
| 12 | 40648043 |
| 13 | 84115695 |
| 14 | 208879433 |
| 15 | 501874561 |
| 16 | 7235123287 |
| 17 | 14972121135 |
| 18 | 37179365557 |
| 19 | 89330852249 |
| 20 | 1287811297043 |
| 21 | 2664953446335 |
| 22 | 6617718189713 |
| 23 | 15900389825761 |
| 24 | 229223175750367 |