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 | 4 |
| 3 | 6 |
| 4 | 21 |
| 5 | 80 |
| 6 | 4151 |
| 7 | 6982 |
| 8 | 269563 |
| 9 | 779693 |
| 10 | 834365 |
| 11 | 16176645 |
| 12 | 19770092 |
| 13 | 41049539 |
| 14 | 228612936 |
| 15 | 1950787140 |
| 16 | 2404785364 |
| 17 | 3095996836 |
| 18 | 5236785750 |