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 | 2 |
| 2 | 6 |
| 3 | 23 |
| 4 | 107 |
| 5 | 590 |
| 6 | 3786 |
| 7 | 27821 |
| 8 | 230869 |
| 9 | 2137978 |
| 10 | 21873854 |
| 11 | 245151555 |
| 12 | 2987967551 |
| 13 | 39358156310 |
| 14 | 557259550034 |
| 15 | 8440866957273 |
| 16 | 136211005966889 |
| 17 | 2333068710452146 |
| 18 | 42276699542130166 |
| 19 | 808068680469402095 |
| 20 | 16248405328930779027 |
| 21 | 342877404288485770718 |
| 22 | 7576652528705018522906 |