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 | 13 |
| 3 | 141 |
| 4 | 1204 |
| 5 | 7570 |
| 6 | 36021 |
| 7 | 136948 |
| 8 | 436696 |
| 9 | 1212399 |
| 10 | 3013165 |
| 11 | 6843991 |
| 12 | 14431308 |
| 13 | 28591576 |
| 14 | 53726869 |
| 15 | 96473910 |
| 16 | 166535536 |
| 17 | 277726093 |
| 18 | 449264781 |
| 19 | 707353489 |
| 20 | 1087078180 |