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 | 3 |
| 4 | 6 |
| 5 | 17 |
| 6 | 43 |
| 7 | 84 |
| 8 | 237 |
| 9 | 599 |
| 10 | 1170 |
| 11 | 3301 |
| 12 | 8343 |
| 13 | 16296 |
| 14 | 45977 |
| 15 | 116203 |
| 16 | 226974 |
| 17 | 640377 |
| 18 | 1618499 |
| 19 | 3161340 |
| 20 | 8919301 |
| 21 | 22542783 |
| 22 | 44031786 |
| 23 | 124229837 |
| 24 | 313980463 |
| 25 | 613283664 |
| 26 | 1730298417 |
| 27 | 4373183699 |
| 28 | 8541939510 |
| 29 | 24099948001 |