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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 2 |
| 8 | 3 |
| 9 | 5 |
| 10 | 12 |
| 11 | 22 |
| 12 | 47 |
| 13 | 94 |
| 14 | 201 |
| 15 | 417 |
| 16 | 907 |
| 17 | 1948 |
| 18 | 4289 |
| 19 | 9440 |
| 20 | 21063 |
| 21 | 47124 |
| 22 | 106377 |
| 23 | 240980 |
| 24 | 549272 |
| 25 | 1256609 |
| 26 | 2888057 |
| 27 | 6660347 |
| 28 | 15416623 |
| 29 | 35794121 |
| 30 | 83362301 |