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 | 67 |
| 2 | 2211 |
| 3 | 47905 |
| 4 | 766480 |
| 5 | 9657648 |
| 6 | 99795696 |
| 7 | 869648208 |
| 8 | 6522361560 |
| 9 | 42757703560 |
| 10 | 247994680648 |
| 11 | 1285063345176 |
| 12 | 5996962277488 |
| 13 | 25371763481680 |
| 14 | 97862516286480 |
| 15 | 345780890878896 |
| 16 | 1123787895356412 |
| 17 | 3371363686069236 |
| 18 | 9364899127970100 |
| 19 | 24151581961607100 |