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 | 2 |
| 3 | 6 |
| 4 | 11 |
| 5 | 24 |
| 6 | 52 |
| 7 | 113 |
| 8 | 248 |
| 9 | 553 |
| 10 | 1245 |
| 11 | 2828 |
| 12 | 6481 |
| 13 | 14963 |
| 14 | 34770 |
| 15 | 81253 |
| 16 | 190836 |
| 17 | 450202 |
| 18 | 1066269 |
| 19 | 2534269 |
| 20 | 6042375 |
| 21 | 14447465 |
| 22 | 34632759 |
| 23 | 83212840 |
| 24 | 200360193 |
| 25 | 483361096 |
| 26 | 1168159015 |
| 27 | 2827750519 |