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) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 30 |
| 5 | 65 |
| 6 | 136 |
| 7 | 279 |
| 8 | 566 |
| 9 | 1141 |
| 10 | 2292 |
| 11 | 4595 |
| 12 | 9202 |
| 13 | 18417 |
| 14 | 36848 |
| 15 | 73711 |
| 16 | 147438 |
| 17 | 294893 |
| 18 | 589804 |
| 19 | 1179627 |
| 20 | 2359274 |
| 21 | 4718569 |
| 22 | 9437160 |
| 23 | 18874343 |
| 24 | 37748710 |
| 25 | 75497445 |
| 26 | 150994916 |
| 27 | 301989859 |
| 28 | 603979746 |
| 29 | 1207959521 |