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 | 2 |
| 2 | 5 |
| 3 | 10 |
| 4 | 21 |
| 5 | 44 |
| 6 | 91 |
| 7 | 190 |
| 8 | 395 |
| 9 | 822 |
| 10 | 1711 |
| 11 | 3560 |
| 12 | 7409 |
| 13 | 15418 |
| 14 | 32085 |
| 15 | 66770 |
| 16 | 138949 |
| 17 | 289156 |
| 18 | 601739 |
| 19 | 1252230 |
| 20 | 2605915 |
| 21 | 5422958 |
| 22 | 11285279 |
| 23 | 23484880 |
| 24 | 48872481 |
| 25 | 101704562 |
| 26 | 211649125 |
| 27 | 440445850 |
| 28 | 916576181 |
| 29 | 1907412444 |
| 30 | 3969361531 |