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 | 11 |
| 3 | 136 |
| 4 | 1787 |
| 5 | 24376 |
| 6 | 341048 |
| 7 | 4859968 |
| 8 | 70223483 |
| 9 | 1025790616 |
| 10 | 15116164136 |
| 11 | 224365547968 |
| 12 | 3350371999928 |
| 13 | 50287277411008 |
| 14 | 758124098549696 |
| 15 | 11473331826459136 |
| 16 | 174221578556572283 |
| 17 | 2653437885092286808 |
| 18 | 40520013896165905928 |