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 | 4 |
| 4 | 10 |
| 5 | 20 |
| 6 | 44 |
| 7 | 88 |
| 8 | 182 |
| 9 | 364 |
| 10 | 738 |
| 11 | 1476 |
| 12 | 2972 |
| 13 | 5944 |
| 14 | 11924 |
| 15 | 23848 |
| 16 | 47768 |
| 17 | 95536 |
| 18 | 191214 |
| 19 | 382428 |
| 20 | 765136 |
| 21 | 1530272 |
| 22 | 3061104 |
| 23 | 6122208 |
| 24 | 12245530 |
| 25 | 24491060 |
| 26 | 48984342 |
| 27 | 97968684 |
| 28 | 195941804 |
| 29 | 391883608 |
| 30 | 783776080 |
| 31 | 1567552160 |
| 32 | 3135122038 |
| 33 | 6270244076 |