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 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 12 |
| 6 | 21 |
| 7 | 38 |
| 8 | 71 |
| 9 | 136 |
| 10 | 265 |
| 11 | 522 |
| 12 | 1035 |
| 13 | 2060 |
| 14 | 4109 |
| 15 | 8206 |
| 16 | 16399 |
| 17 | 32784 |
| 18 | 65553 |
| 19 | 131090 |
| 20 | 262163 |
| 21 | 524308 |
| 22 | 1048597 |
| 23 | 2097174 |
| 24 | 4194327 |
| 25 | 8388632 |
| 26 | 16777241 |
| 27 | 33554458 |
| 28 | 67108891 |
| 29 | 134217756 |
| 30 | 268435485 |