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 | 1 |
| 3 | 5 |
| 4 | 7 |
| 5 | 21 |
| 6 | 37 |
| 7 | 89 |
| 8 | 173 |
| 9 | 383 |
| 10 | 777 |
| 11 | 1665 |
| 12 | 3441 |
| 13 | 7277 |
| 14 | 15159 |
| 15 | 31885 |
| 16 | 66645 |
| 17 | 139865 |
| 18 | 292757 |
| 19 | 613823 |
| 20 | 1285585 |
| 21 | 2694433 |
| 22 | 5644609 |
| 23 | 11828501 |
| 24 | 24782311 |
| 25 | 51928773 |
| 26 | 108802597 |
| 27 | 227978105 |
| 28 | 477674813 |
| 29 | 1000877759 |
| 30 | 2097121497 |
| 31 | 4394101857 |