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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 9 |
| 3 | 19 |
| 4 | 38 |
| 5 | 75 |
| 6 | 147 |
| 7 | 288 |
| 8 | 565 |
| 9 | 1111 |
| 10 | 2190 |
| 11 | 4327 |
| 12 | 8567 |
| 13 | 16992 |
| 14 | 33753 |
| 15 | 67131 |
| 16 | 133654 |
| 17 | 266323 |
| 18 | 531051 |
| 19 | 1059520 |
| 20 | 2114861 |
| 21 | 4222959 |
| 22 | 8434974 |
| 23 | 16852239 |
| 24 | 33675823 |
| 25 | 67305280 |
| 26 | 134535537 |
| 27 | 268949683 |
| 28 | 537702950 |
| 29 | 1075088091 |
| 30 | 2149661955 |
| 31 | 4298491872 |
| 32 | 8595637477 |