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 | 1 |
| 2 | 66 |
| 3 | 992 |
| 4 | 9846 |
| 5 | 86782 |
| 6 | 765506 |
| 7 | 7112202 |
| 8 | 71000398 |
| 9 | 766053422 |
| 10 | 8931231882 |
| 11 | 112221527986 |
| 12 | 1514394506102 |
| 13 | 21867699419238 |
| 14 | 336675784490002 |
| 15 | 5508056657818442 |
| 16 | 95455624774115166 |
| 17 | 1747299831395273182 |
| 18 | 33693372749353108058 |
| 19 | 682771622138237836962 |