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 | 8 |
| 4 | 57 |
| 5 | 256 |
| 6 | 1153 |
| 7 | 4181 |
| 8 | 14180 |
| 9 | 47381 |
| 10 | 115267 |
| 11 | 307214 |
| 12 | 737909 |
| 13 | 1682367 |
| 14 | 3850940 |
| 15 | 8557010 |
| 16 | 18311575 |
| 17 | 37925058 |
| 18 | 61662056 |