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 | 735 |
| 3 | 12005 |
| 4 | 168070 |
| 5 | 2117682 |
| 6 | 24706290 |
| 7 | 271769190 |
| 8 | 2853576495 |
| 9 | 28852829005 |
| 10 | 282757724249 |
| 11 | 2699051004195 |
| 12 | 25191142705820 |
| 13 | 230595844768660 |
| 14 | 2075362602917940 |
| 15 | 18401548412539068 |
| 16 | 161013548609716845 |
| 17 | 1392293626213433895 |
| 18 | 11911845468714934435 |
| 19 | 100937216866479181265 |