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 | 4 |
| 3 | 10 |
| 4 | 30 |
| 5 | 101 |
| 6 | 395 |
| 7 | 1769 |
| 8 | 9020 |
| 9 | 51674 |
| 10 | 328936 |
| 11 | 2303323 |
| 12 | 17595765 |
| 13 | 145622477 |
| 14 | 1297884212 |
| 15 | 12393874652 |
| 16 | 126242962310 |
| 17 | 1366268975165 |
| 18 | 15656289178423 |
| 19 | 189374961382141 |
| 20 | 2411196896699700 |
| 21 | 32235328003898918 |
| 22 | 451476237890591144 |
| 23 | 6610630095177242675 |