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 | 31 |
| 2 | 41 |
| 3 | 271 |
| 4 | 811 |
| 5 | 77761 |
| 6 | 641 |
| 7 | 21871 |
| 8 | 16796161 |
| 9 | 196831 |
| 10 | 259374246011 |
| 11 | 19773267431 |
| 12 | 40961 |
| 13 | 9688901040700000000000001 |
| 14 | 163841 |
| 15 | 1368800680154120519681 |
| 16 | 1214395310965942517761 |
| 17 | 58744031063604200188795536431 |
| 18 | 3874204891 |
| 19 | 2748779069441 |
| 20 | 1757494343868923397049845066579063588307980412147890120011 |