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 | 31 |
| 3 | 2659 |
| 4 | 28921 |
| 5 | 20254277 |
| 6 | 222258347161 |
| 7 | 6703502508238897 |
| 8 | 2849796577598550571 |
| 9 | 163260594826469315359 |
| 10 | 78587320839900014133983 |
| 11 | 63082726980138277941240209 |
| 12 | 28861909227691304085982177103 |
| 13 | 17774573388934687063056536849453 |