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) |
|---|---|
| 8 | 1 |
| 9 | 0 |
| 10 | 1 |
| 11 | 1 |
| 12 | 5 |
| 13 | 5 |
| 14 | 21 |
| 15 | 40 |
| 16 | 176 |
| 17 | 500 |
| 18 | 2053 |
| 19 | 7532 |
| 20 | 31206 |
| 21 | 124552 |
| 22 | 521332 |
| 23 | 2167599 |
| 24 | 9183879 |
| 25 | 38965327 |
| 26 | 166956753 |
| 27 | 718004565 |
| 28 | 3107450143 |
| 29 | 13502835176 |
| 30 | 58956369552 |
| 31 | 258398671525 |