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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 11 |
| 6 | 29 |
| 7 | 74 |
| 8 | 205 |
| 9 | 578 |
| 10 | 1683 |
| 11 | 4978 |
| 12 | 15000 |
| 13 | 45672 |
| 14 | 140600 |
| 15 | 436421 |
| 16 | 1364876 |
| 17 | 4295403 |
| 18 | 13594685 |
| 19 | 43238514 |