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 | 8 |
| 5 | 21 |
| 6 | 56 |
| 7 | 144 |
| 8 | 370 |
| 9 | 926 |
| 10 | 2275 |
| 11 | 5482 |
| 12 | 12966 |
| 13 | 30124 |
| 14 | 68838 |
| 15 | 154934 |
| 16 | 343756 |
| 17 | 752689 |
| 18 | 1627701 |
| 19 | 3479226 |
| 20 | 7355608 |
| 21 | 15390682 |
| 22 | 31889732 |
| 23 | 65465473 |
| 24 | 133212912 |
| 25 | 268811363 |
| 26 | 538119723 |
| 27 | 1069051243 |
| 28 | 2108416588 |
| 29 | 4129355331 |
| 30 | 8033439333 |