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 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 8 |
| 6 | 17 |
| 7 | 31 |
| 8 | 68 |
| 9 | 145 |
| 10 | 325 |
| 11 | 728 |
| 12 | 1685 |
| 13 | 3891 |
| 14 | 9140 |
| 15 | 21565 |
| 16 | 51311 |
| 17 | 122666 |
| 18 | 295037 |
| 19 | 712477 |
| 20 | 1728262 |
| 21 | 4207027 |
| 22 | 10276693 |
| 23 | 25178708 |
| 24 | 61866141 |
| 25 | 152397945 |
| 26 | 376309596 |
| 27 | 931239093 |
| 28 | 2309219447 |
| 29 | 5737078442 |
| 30 | 14278587533 |
| 31 | 35595622719 |