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 | 5 |
| 4 | 9 |
| 5 | 18 |
| 6 | 39 |
| 7 | 77 |
| 8 | 160 |
| 9 | 331 |
| 10 | 675 |
| 11 | 1394 |
| 12 | 2871 |
| 13 | 5899 |
| 14 | 12168 |
| 15 | 25047 |
| 16 | 51585 |
| 17 | 106316 |
| 18 | 219047 |
| 19 | 451361 |
| 20 | 930512 |
| 21 | 1917713 |
| 22 | 3953407 |
| 23 | 8150624 |
| 24 | 16804773 |
| 25 | 34649369 |
| 26 | 71453844 |
| 27 | 147346015 |
| 28 | 303878941 |
| 29 | 626728864 |
| 30 | 1292649339 |
| 31 | 2666247721 |