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 | 0 |
| 1 | 3 |
| 2 | 105 |
| 3 | 3570 |
| 4 | 121278 |
| 5 | 4119885 |
| 6 | 139954815 |
| 7 | 4754343828 |
| 8 | 161507735340 |
| 9 | 5486508657735 |
| 10 | 186379786627653 |
| 11 | 6331426236682470 |
| 12 | 215082112260576330 |
| 13 | 7306460390622912753 |
| 14 | 248204571168918457275 |
| 15 | 8431648959352604634600 |
| 16 | 286427860046819639119128 |