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) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 43 |
| 3 | 336 |
| 4 | 2864 |
| 5 | 25326 |
| 6 | 223034 |
| 7 | 1890123 |
| 8 | 15115098 |
| 9 | 112980937 |
| 10 | 787320629 |
| 11 | 5121184083 |
| 12 | 31188412225 |
| 13 | 178517111561 |
| 14 | 964196387369 |
| 15 | 4933278065881 |
| 16 | 23997707450765 |
| 17 | 111358094980387 |
| 18 | 494444748602595 |
| 19 | 2106504840061571 |