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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 26 |
| 5 | 56 |
| 6 | 114 |
| 7 | 232 |
| 8 | 466 |
| 9 | 936 |
| 10 | 1878 |
| 11 | 3758 |
| 12 | 7522 |
| 13 | 15048 |
| 14 | 30098 |
| 15 | 60200 |
| 16 | 120406 |
| 17 | 240818 |
| 18 | 481638 |
| 19 | 963282 |
| 20 | 1926568 |
| 21 | 3853138 |
| 22 | 7706282 |
| 23 | 15412568 |
| 24 | 30825142 |
| 25 | 61650292 |
| 26 | 123300588 |
| 27 | 246601178 |
| 28 | 493202360 |
| 29 | 986404722 |
| 30 | 1972809448 |
| 31 | 3945618910 |