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 | 2 |
| 1 | 16 |
| 2 | 88 |
| 3 | 364 |
| 4 | 1309 |
| 5 | 4126 |
| 6 | 11992 |
| 7 | 32368 |
| 8 | 82590 |
| 9 | 200487 |
| 10 | 467152 |
| 11 | 1049224 |
| 12 | 2283364 |
| 13 | 4829302 |
| 14 | 9959035 |
| 15 | 20069790 |
| 16 | 39612612 |
| 17 | 76703340 |
| 18 | 145945332 |
| 19 | 273224940 |
| 20 | 503888206 |
| 21 | 916373028 |
| 22 | 1644925432 |
| 23 | 2916814954 |
| 24 | 5113148026 |
| 25 | 8866911378 |
| 26 | 15220453704 |