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 | 1 |
| 2 | 4141 |
| 3 | 85285 |
| 4 | 429332905 |
| 5 | 8842505113 |
| 6 | 44514094237813 |
| 7 | 916808615026525 |
| 8 | 4615310318335580305 |
| 9 | 95056550814337645681 |
| 10 | 478524604381155542930941 |
| 11 | 9855653300615347164456661 |
| 12 | 49614388026831658683830230201 |
| 13 | 1021853845419343873890857865865 |