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 | 7 |
| 2 | 112 |
| 3 | 2464 |
| 4 | 65520 |
| 5 | 1991808 |
| 6 | 67189248 |
| 7 | 2469837888 |
| 8 | 97765355520 |
| 9 | 4132860197760 |
| 10 | 185458263419520 |
| 11 | 8794132843507200 |
| 12 | 439083652465543680 |
| 13 | 23017956568726049280 |
| 14 | 1263929372436815078400 |
| 15 | 72550400791147384412160 |