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 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 3 |
| 8 | 9 |
| 9 | 12 |
| 10 | 27 |
| 11 | 42 |
| 12 | 91 |
| 13 | 151 |
| 14 | 312 |
| 15 | 550 |
| 16 | 1099 |
| 17 | 2026 |
| 18 | 3999 |
| 19 | 7527 |
| 20 | 14804 |
| 21 | 28336 |
| 22 | 55641 |
| 23 | 107737 |
| 24 | 211851 |
| 25 | 413508 |
| 26 | 814971 |
| 27 | 1600512 |
| 28 | 3162761 |
| 29 | 6241234 |