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 | 2 |
| 2 | 36 |
| 3 | 980 |
| 4 | 33040 |
| 5 | 1268568 |
| 6 | 53105976 |
| 7 | 2364239592 |
| 8 | 110206067400 |
| 9 | 5323547715200 |
| 10 | 264576141331216 |
| 11 | 13458185494436592 |
| 12 | 697931136204820336 |
| 13 | 36789784967375728400 |
| 14 | 1966572261077797609200 |
| 15 | 106400946932857148590800 |
| 16 | 5817987630644593688220600 |
| 17 | 321105713814359742307398480 |