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 | 4 |
| 4 | 10 |
| 5 | 19 |
| 6 | 40 |
| 7 | 91 |
| 8 | 199 |
| 9 | 427 |
| 10 | 928 |
| 11 | 2026 |
| 12 | 4405 |
| 13 | 9568 |
| 14 | 20809 |
| 15 | 45265 |
| 16 | 98425 |
| 17 | 214012 |
| 18 | 465394 |
| 19 | 1012051 |
| 20 | 2200744 |
| 21 | 4785619 |
| 22 | 10406647 |
| 23 | 22629907 |
| 24 | 49210024 |
| 25 | 107010082 |
| 26 | 232699861 |
| 27 | 506019712 |
| 28 | 1100369809 |
| 29 | 2392819489 |
| 30 | 5203328305 |