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) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 105 |
| 4 | 1140 |
| 5 | 12650 |
| 6 | 142506 |
| 7 | 1623160 |
| 8 | 18643560 |
| 9 | 215553195 |
| 10 | 2505433700 |
| 11 | 29248649430 |
| 12 | 342700125300 |
| 13 | 4027810484880 |
| 14 | 47465835030320 |
| 15 | 560658857389200 |
| 16 | 6635869816740560 |
| 17 | 78682166288559225 |
| 18 | 934433788613079150 |