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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 8 |
| 5 | 26 |
| 6 | 52 |
| 7 | 143 |
| 8 | 317 |
| 9 | 811 |
| 10 | 1884 |
| 11 | 4668 |
| 12 | 11076 |
| 13 | 27053 |
| 14 | 64805 |
| 15 | 157273 |
| 16 | 378364 |
| 17 | 915598 |
| 18 | 2206976 |
| 19 | 5333731 |
| 20 | 12867673 |
| 21 | 31080023 |
| 22 | 75010008 |
| 23 | 181128696 |
| 24 | 437221032 |
| 25 | 1055645785 |
| 26 | 2548391209 |
| 27 | 6152624621 |
| 28 | 14853322640 |
| 29 | 35859784130 |
| 30 | 86572058860 |