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) |
|---|---|
| 0 | 1 |
| 1 | 42 |
| 2 | 1765 |
| 3 | 74172 |
| 4 | 3116989 |
| 5 | 130987710 |
| 6 | 5504600809 |
| 7 | 231324221688 |
| 8 | 9721121911705 |
| 9 | 408518444513298 |
| 10 | 17167495791470221 |
| 11 | 721443341686262580 |
| 12 | 30317787846614498581 |
| 13 | 1274068532899495202982 |
| 14 | 53541196169625413023825 |
| 15 | 2250004307657166842203632 |