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 | 10 |
| 5 | 42 |
| 6 | 146 |
| 7 | 314 |
| 8 | 1806 |
| 9 | 23226 |
| 10 | 42814 |
| 11 | 141578 |
| 12 | 395002 |
| 13 | 3263442 |
| 14 | 542731938 |
| 15 | 2372530250 |
| 16 | 21123367578 |
| 17 | 41921883010 |
| 18 | 216160029242 |
| 19 | 780133887002 |
| 20 | 10650056950806 |
| 21 | 294568607121655146 |
| 22 | 5923457746066090230 |
| 23 | 11257799577242104090 |
| 24 | 446785773769478686986 |
| 25 | 2209269832769594087610 |