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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 18 |
| 5 | 41 |
| 6 | 117 |
| 7 | 299 |
| 8 | 861 |
| 9 | 2413 |
| 10 | 6955 |
| 11 | 19943 |
| 12 | 57974 |
| 13 | 168013 |
| 14 | 489789 |
| 15 | 1428611 |
| 16 | 4177232 |
| 17 | 12226997 |
| 18 | 35847123 |
| 19 | 105200351 |
| 20 | 309086838 |
| 21 | 908931221 |
| 22 | 2675276801 |
| 23 | 7880255915 |
| 24 | 23228969891 |
| 25 | 68518137777 |
| 26 | 202231890207 |
| 27 | 597228362551 |
| 28 | 1764663912122 |