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 | 312 |
| 3 | 30798 |
| 4 | 3941280 |
| 5 | 586637250 |
| 6 | 96197630040 |
| 7 | 16875655269942 |
| 8 | 3111284137104000 |
| 9 | 595909785174026400 |
| 10 | 117634021776545937000 |
| 11 | 23797087019979071174574 |
| 12 | 4912693780461256332795168 |
| 13 | 1031629572413246016139181538 |
| 14 | 219809927417367517614451764984 |