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 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 34 |
| 5 | 80 |
| 6 | 254 |
| 7 | 604 |
| 8 | 1785 |
| 9 | 4370 |
| 10 | 11986 |
| 11 | 29286 |
| 12 | 80355 |
| 13 | 193137 |
| 14 | 505952 |
| 15 | 1239348 |
| 16 | 3181970 |
| 17 | 7686199 |
| 18 | 19520906 |
| 19 | 46931241 |
| 20 | 117334784 |
| 21 | 282021070 |
| 22 | 693721166 |
| 23 | 1659075192 |
| 24 | 4063164983 |
| 25 | 9651686516 |
| 26 | 23347635094 |
| 27 | 55405326513 |
| 28 | 133021397071 |
| 29 | 313842472333 |
| 30 | 749299686508 |