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 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 9 |
| 5 | 21 |
| 6 | 45 |
| 7 | 93 |
| 8 | 189 |
| 9 | 381 |
| 10 | 765 |
| 11 | 1533 |
| 12 | 3069 |
| 13 | 6141 |
| 14 | 12285 |
| 15 | 24573 |
| 16 | 49149 |
| 17 | 98301 |
| 18 | 196605 |
| 19 | 393213 |
| 20 | 786429 |
| 21 | 1572861 |
| 22 | 3145725 |
| 23 | 6291453 |
| 24 | 12582909 |
| 25 | 25165821 |
| 26 | 50331645 |
| 27 | 100663293 |
| 28 | 201326589 |
| 29 | 402653181 |
| 30 | 805306365 |
| 31 | 1610612733 |
| 32 | 3221225469 |