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 | 35 |
| 2 | 420 |
| 3 | 2940 |
| 4 | 14700 |
| 5 | 58212 |
| 6 | 194040 |
| 7 | 566280 |
| 8 | 1486485 |
| 9 | 3578575 |
| 10 | 8016008 |
| 11 | 16893240 |
| 12 | 33786480 |
| 13 | 64574160 |
| 14 | 118605600 |
| 15 | 210327264 |
| 16 | 361499985 |
| 17 | 604167795 |
| 18 | 984569740 |
| 19 | 1568220500 |
| 20 | 2446423980 |
| 21 | 3744526500 |
| 22 | 5632263000 |
| 23 | 8336601000 |
| 24 | 12157543125 |
| 25 | 17487410031 |
| 26 | 24834191760 |