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 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 8 |
| 5 | 13 |
| 6 | 26 |
| 7 | 55 |
| 8 | 154 |
| 9 | 356 |
| 10 | 884 |
| 11 | 2161 |
| 12 | 5440 |
| 13 | 13511 |
| 14 | 33780 |
| 15 | 84398 |
| 16 | 211338 |
| 17 | 528999 |
| 18 | 1325014 |
| 19 | 3319005 |
| 20 | 8315948 |
| 21 | 20836784 |
| 22 | 52214530 |
| 23 | 130847203 |
| 24 | 327910100 |
| 25 | 821772985 |
| 26 | 2059471558 |
| 27 | 5161348174 |
| 28 | 12935209836 |
| 29 | 32417941793 |
| 30 | 81245379630 |
| 31 | 203616360639 |