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 | 3 |
| 1 | 8 |
| 2 | 36 |
| 3 | 240 |
| 4 | 2520 |
| 5 | 32340 |
| 6 | 540540 |
| 7 | 10210200 |
| 8 | 232792560 |
| 9 | 6692786100 |
| 10 | 207030183360 |
| 11 | 7621298624940 |
| 12 | 311671001662020 |
| 13 | 13387011595197240 |
| 14 | 627972543920161440 |
| 15 | 33204048259778536140 |
| 16 | 1955349508631402683800 |
| 17 | 119211141709561183622340 |
| 18 | 7975609932439674026862360 |
| 19 | 565799151677779228023294480 |
| 20 | 41287621429375723111588738860 |