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 | 13 |
| 5 | 25 |
| 6 | 46 |
| 7 | 84 |
| 8 | 155 |
| 9 | 291 |
| 10 | 556 |
| 11 | 1078 |
| 12 | 2113 |
| 13 | 4173 |
| 14 | 8282 |
| 15 | 16488 |
| 16 | 32887 |
| 17 | 65671 |
| 18 | 131224 |
| 19 | 262314 |
| 20 | 524477 |
| 21 | 1048785 |
| 22 | 2097382 |
| 23 | 4194556 |
| 24 | 8388883 |
| 25 | 16777515 |
| 26 | 33554756 |
| 27 | 67109214 |
| 28 | 134218105 |
| 29 | 268435861 |
| 30 | 536871346 |
| 31 | 1073742288 |
| 32 | 2147484143 |
| 33 | 4294967823 |
| 34 | 8589935152 |
| 35 | 17179869778 |