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 | 2 |
| 2 | 6 |
| 3 | 22 |
| 4 | 106 |
| 5 | 582 |
| 6 | 3622 |
| 7 | 24060 |
| 8 | 167803 |
| 9 | 1206852 |
| 10 | 8881775 |
| 11 | 66496238 |
| 12 | 504729590 |
| 13 | 3874281594 |
| 14 | 30020527274 |
| 15 | 234498941338 |
| 16 | 1844550287865 |
| 17 | 14597849688004 |
| 18 | 116151844649673 |
| 19 | 928633009522942 |
| 20 | 7456338969251761 |
| 21 | 60101579662366508 |
| 22 | 486145542528043029 |
| 23 | 3944844113529346468 |