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 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 34 |
| 5 | 82 |
| 6 | 198 |
| 7 | 478 |
| 8 | 1154 |
| 9 | 2786 |
| 10 | 6726 |
| 11 | 16238 |
| 12 | 39202 |
| 13 | 94642 |
| 14 | 228486 |
| 15 | 551614 |
| 16 | 1331714 |
| 17 | 3215042 |
| 18 | 7761798 |
| 19 | 18738638 |
| 20 | 45239074 |
| 21 | 109216786 |
| 22 | 263672646 |
| 23 | 636562078 |
| 24 | 1536796802 |
| 25 | 3710155682 |
| 26 | 8957108166 |
| 27 | 21624372014 |
| 28 | 52205852194 |
| 29 | 126036076402 |
| 30 | 304278004998 |