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 | 8 |
| 2 | 14 |
| 3 | 26 |
| 4 | 50 |
| 5 | 98 |
| 6 | 194 |
| 7 | 386 |
| 8 | 770 |
| 9 | 1538 |
| 10 | 3074 |
| 11 | 6146 |
| 12 | 12290 |
| 13 | 24578 |
| 14 | 49154 |
| 15 | 98306 |
| 16 | 196610 |
| 17 | 393218 |
| 18 | 786434 |
| 19 | 1572866 |
| 20 | 3145730 |
| 21 | 6291458 |
| 22 | 12582914 |
| 23 | 25165826 |
| 24 | 50331650 |
| 25 | 100663298 |
| 26 | 201326594 |
| 27 | 402653186 |
| 28 | 805306370 |
| 29 | 1610612738 |
| 30 | 3221225474 |