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 | 4 |
| 2 | 62 |
| 3 | 1350266 |
| 4 | 7217219419 |
| 5 | 662282997049 |
| 6 | 131048548574311 |
| 7 | 1476501837943501 |
| 8 | 77398992743877949 |
| 9 | 1009160086034826303 |
| 10 | 7334718374224277375323 |
| 11 | 267139368935075847112946291 |
| 12 | 149235809291913788071835702010683 |
| 13 | 1385662433217897970940689446154295119 |