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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 7 |
| 6 | 14 |
| 7 | 27 |
| 8 | 55 |
| 9 | 111 |
| 10 | 232 |
| 11 | 486 |
| 12 | 1039 |
| 13 | 2226 |
| 14 | 4820 |
| 15 | 10449 |
| 16 | 22727 |
| 17 | 49354 |
| 18 | 107117 |
| 19 | 231774 |
| 20 | 500040 |
| 21 | 1074476 |
| 22 | 2299589 |
| 23 | 4899650 |