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 | 2 |
| 3 | 5 |
| 4 | 17 |
| 5 | 62 |
| 6 | 258 |
| 7 | 1050 |
| 8 | 4365 |
| 9 | 18012 |
| 10 | 73945 |
| 11 | 301073 |
| 12 | 1214876 |
| 13 | 4852899 |
| 14 | 19187598 |
| 15 | 75070201 |
| 16 | 290659230 |
| 17 | 1113785613 |
| 18 | 4224773811 |
| 19 | 15866483556 |
| 20 | 59011553910 |
| 21 | 217410395916 |
| 22 | 793635925091 |
| 23 | 2871246090593 |
| 24 | 10297627606547 |
| 25 | 36620869115355 |
| 26 | 129166280330900 |