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 | 3 |
| 3 | 6 |
| 4 | 11 |
| 5 | 23 |
| 6 | 53 |
| 7 | 132 |
| 8 | 359 |
| 9 | 1068 |
| 10 | 3386 |
| 11 | 11435 |
| 12 | 40807 |
| 13 | 152807 |
| 14 | 597662 |
| 15 | 2430734 |
| 16 | 10237458 |
| 17 | 44489603 |
| 18 | 198831994 |
| 19 | 911063459 |