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 | 3 |
| 3 | 12 |
| 4 | 52 |
| 5 | 237 |
| 6 | 1113 |
| 7 | 5339 |
| 8 | 26011 |
| 9 | 128247 |
| 10 | 638346 |
| 11 | 3201967 |
| 12 | 16164384 |
| 13 | 82044151 |
| 14 | 418352107 |
| 15 | 2141761669 |
| 16 | 11003117220 |