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) |
|---|---|
| 2 | 1 |
| 3 | 52 |
| 4 | 4719 |
| 5 | 731646 |
| 6 | 180969681 |
| 7 | 67248150516 |
| 8 | 35761409868799 |
| 9 | 26171895174386074 |
| 10 | 25537783651103627553 |
| 11 | 32371132757348207385432 |
| 12 | 52159852880632068558079935 |
| 13 | 104892775358552507916875176230 |
| 14 | 259149523892854600494809451180913 |
| 15 | 775933771666481617801146254754889372 |