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 | 3 |
| 2 | 11 |
| 3 | 41 |
| 4 | 157 |
| 5 | 607 |
| 6 | 2367 |
| 7 | 9277 |
| 8 | 36505 |
| 9 | 144059 |
| 10 | 569779 |
| 11 | 2257521 |
| 12 | 8957109 |
| 13 | 35579351 |
| 14 | 141460391 |
| 15 | 562871557 |
| 16 | 2241129905 |
| 17 | 8928207987 |
| 18 | 35584894299 |
| 19 | 141886838329 |
| 20 | 565938926669 |