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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 10 |
| 7 | 24 |
| 8 | 57 |
| 9 | 144 |
| 10 | 360 |
| 11 | 923 |
| 12 | 2382 |
| 13 | 6246 |
| 14 | 16486 |
| 15 | 43917 |
| 16 | 117692 |
| 17 | 317447 |
| 18 | 860574 |
| 19 | 2344396 |
| 20 | 6413119 |
| 21 | 17611086 |
| 22 | 48527597 |
| 23 | 134141819 |
| 24 | 371862485 |
| 25 | 1033588413 |
| 26 | 2879818379 |
| 27 | 8041870070 |
| 28 | 22503533295 |
| 29 | 63093284667 |
| 30 | 177213424466 |