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 | 6 |
| 1 | 137 |
| 2 | 2436 |
| 3 | 40614 |
| 4 | 673470 |
| 5 | 11389140 |
| 6 | 198793980 |
| 7 | 3602823840 |
| 8 | 67991283360 |
| 9 | 1337641905600 |
| 10 | 27440275262400 |
| 11 | 586731694348800 |
| 12 | 13067437397414400 |
| 13 | 302870068070169600 |
| 14 | 7298072456298624000 |