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 | 2 |
| 3 | 6 |
| 4 | 16 |
| 5 | 36 |
| 6 | 82 |
| 7 | 176 |
| 8 | 372 |
| 9 | 768 |
| 10 | 1582 |
| 11 | 3224 |
| 12 | 6534 |
| 13 | 13166 |
| 14 | 26504 |
| 15 | 53244 |
| 16 | 106824 |
| 17 | 214060 |
| 18 | 428764 |
| 19 | 858400 |
| 20 | 1718056 |
| 21 | 3437734 |
| 22 | 6877896 |
| 23 | 13759154 |
| 24 | 27523128 |
| 25 | 55052582 |
| 26 | 110114618 |
| 27 | 220242288 |
| 28 | 440503282 |
| 29 | 881031714 |
| 30 | 1762100362 |
| 31 | 3524251618 |
| 32 | 7048576724 |
| 33 | 14097253490 |