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 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 20 |
| 6 | 39 |
| 7 | 96 |
| 8 | 191 |
| 9 | 432 |
| 10 | 863 |
| 11 | 1856 |
| 12 | 3711 |
| 13 | 7744 |
| 14 | 15487 |
| 15 | 31744 |
| 16 | 63487 |
| 17 | 128768 |
| 18 | 257535 |
| 19 | 519168 |
| 20 | 1038335 |
| 21 | 2085888 |
| 22 | 4171775 |
| 23 | 8364032 |
| 24 | 16728063 |
| 25 | 33501184 |
| 26 | 67002367 |
| 27 | 134103040 |
| 28 | 268206079 |
| 29 | 536625152 |
| 30 | 1073250303 |
| 31 | 2146959360 |