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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 16 |
| 7 | 35 |
| 8 | 66 |
| 9 | 133 |
| 10 | 261 |
| 11 | 527 |
| 12 | 1032 |
| 13 | 2079 |
| 14 | 4123 |
| 15 | 8244 |
| 16 | 16440 |
| 17 | 32895 |
| 18 | 65639 |
| 19 | 131327 |
| 20 | 262380 |
| 21 | 524762 |
| 22 | 1049071 |
| 23 | 2098175 |
| 24 | 4195230 |
| 25 | 8390646 |
| 26 | 16779231 |
| 27 | 33558392 |
| 28 | 67112892 |
| 29 | 134225919 |
| 30 | 268443306 |