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 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 35 |
| 7 | 74 |
| 8 | 154 |
| 9 | 324 |
| 10 | 677 |
| 11 | 1422 |
| 12 | 2977 |
| 13 | 6246 |
| 14 | 13086 |
| 15 | 27444 |
| 16 | 57518 |
| 17 | 120600 |
| 18 | 252794 |
| 19 | 529994 |
| 20 | 1111013 |
| 21 | 2329187 |
| 22 | 4882755 |
| 23 | 10236280 |
| 24 | 21458943 |
| 25 | 44986461 |
| 26 | 94308415 |
| 27 | 197707134 |
| 28 | 414469000 |
| 29 | 868886834 |
| 30 | 1821517772 |
| 31 | 3818600772 |