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 | 86 |
| 5 | 4182 |
| 6 | 69718 |
| 7 | 331862 |
| 8 | 1074073686 |
| 9 | 1152921505680920662 |
| 10 | 309485010974266574405701718 |
| 11 | 81129947899617655962363410845782 |
| 12 | 85070672860182515483499614221352898646 |