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 | 3 |
| 2 | 10 |
| 3 | 41 |
| 4 | 190 |
| 5 | 946 |
| 6 | 4940 |
| 7 | 26693 |
| 8 | 147990 |
| 9 | 837102 |
| 10 | 4811860 |
| 11 | 28027210 |
| 12 | 165057100 |
| 13 | 981177060 |
| 14 | 5879570200 |
| 15 | 35478788269 |
| 16 | 215398416870 |
| 17 | 1314794380374 |
| 18 | 8064119033220 |
| 19 | 49673222082782 |
| 20 | 307163049317540 |
| 21 | 1906066361809148 |
| 22 | 11865666767361960 |
| 23 | 74081851132379426 |