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 | -3 |
| 1 | 0 |
| 2 | 5 |
| 3 | 8 |
| 4 | 21 |
| 5 | 48 |
| 6 | 65 |
| 7 | 140 |
| 8 | 297 |
| 9 | 396 |
| 10 | 833 |
| 11 | 1748 |
| 12 | 2325 |
| 13 | 4872 |
| 14 | 10205 |
| 15 | 13568 |
| 16 | 28413 |
| 17 | 59496 |
| 18 | 79097 |
| 19 | 165620 |
| 20 | 346785 |
| 21 | 461028 |
| 22 | 965321 |
| 23 | 2021228 |
| 24 | 2687085 |
| 25 | 5626320 |
| 26 | 11780597 |
| 27 | 15661496 |
| 28 | 32792613 |
| 29 | 68662368 |
| 30 | 91281905 |
| 31 | 191129372 |
| 32 | 400193625 |
| 33 | 532029948 |
| 34 | 1113983633 |