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 | 2 |
| 2 | 4 |
| 3 | 11 |
| 4 | 43 |
| 5 | 218 |
| 6 | 1336 |
| 7 | 9557 |
| 8 | 78053 |
| 9 | 714578 |
| 10 | 7223548 |
| 11 | 79704015 |
| 12 | 951626175 |
| 13 | 12210506762 |
| 14 | 167413540912 |
| 15 | 2440529176297 |
| 16 | 37665520151241 |
| 17 | 613124748803618 |
| 18 | 10492684074110772 |
| 19 | 188241358671950227 |
| 20 | 3531254422923432083 |