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 | 7 |
| 5 | 15 |
| 6 | 32 |
| 7 | 69 |
| 8 | 154 |
| 9 | 346 |
| 10 | 786 |
| 11 | 1806 |
| 12 | 4180 |
| 13 | 9745 |
| 14 | 22865 |
| 15 | 53938 |
| 16 | 127865 |
| 17 | 304447 |
| 18 | 727733 |
| 19 | 1745736 |
| 20 | 4201350 |
| 21 | 10140975 |
| 22 | 24544000 |
| 23 | 59551327 |
| 24 | 144822097 |
| 25 | 352940719 |
| 26 | 861839226 |
| 27 | 2108381480 |
| 28 | 5166749329 |
| 29 | 12681855551 |
| 30 | 31174671514 |
| 31 | 76742344774 |