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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 10 |
| 6 | 19 |
| 7 | 38 |
| 8 | 75 |
| 9 | 133 |
| 10 | 247 |
| 11 | 453 |
| 12 | 843 |
| 13 | 1520 |
| 14 | 2751 |
| 15 | 5043 |
| 16 | 9317 |
| 17 | 17220 |
| 18 | 31221 |
| 19 | 57070 |
| 20 | 99737 |
| 21 | 181693 |
| 22 | 328254 |
| 23 | 589930 |