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 | 7 |
| 3 | 17 |
| 4 | 39 |
| 5 | 85 |
| 6 | 181 |
| 7 | 387 |
| 8 | 839 |
| 9 | 1829 |
| 10 | 3953 |
| 11 | 8391 |
| 12 | 17461 |
| 13 | 35759 |
| 14 | 72559 |
| 15 | 146921 |
| 16 | 298631 |
| 17 | 611733 |
| 18 | 1265185 |
| 19 | 2641351 |
| 20 | 5555729 |
| 21 | 11735571 |
| 22 | 24798755 |
| 23 | 52219493 |
| 24 | 109213269 |
| 25 | 226322799 |
| 26 | 464125219 |
| 27 | 941694917 |
| 28 | 1891879215 |
| 29 | 3769497853 |
| 30 | 7465462669 |
| 31 | 14735667195 |
| 32 | 29070011399 |