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 | 6 |
| 2 | 108 |
| 3 | 12630 |
| 4 | 30263484 |
| 5 | 27712501015350 |
| 6 | 7560818318577145967460876 |
| 7 | 469290709294376894968630603296687409248422837718 |