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 | 5 |
| 1 | 12 |
| 2 | 26 |
| 3 | 54 |
| 4 | 110 |
| 5 | 222 |
| 6 | 446 |
| 7 | 894 |
| 8 | 1790 |
| 9 | 3582 |
| 10 | 7166 |
| 11 | 14334 |
| 12 | 28670 |
| 13 | 57342 |
| 14 | 114686 |
| 15 | 229374 |
| 16 | 458750 |
| 17 | 917502 |
| 18 | 1835006 |
| 19 | 3670014 |
| 20 | 7340030 |
| 21 | 14680062 |
| 22 | 29360126 |
| 23 | 58720254 |
| 24 | 117440510 |
| 25 | 234881022 |
| 26 | 469762046 |
| 27 | 939524094 |
| 28 | 1879048190 |
| 29 | 3758096382 |