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 | 5 |
| 1 | 65 |
| 2 | 511 |
| 3 | 3130 |
| 4 | 16435 |
| 5 | 77645 |
| 6 | 339535 |
| 7 | 1399478 |
| 8 | 5504650 |
| 9 | 20845300 |
| 10 | 76495450 |
| 11 | 273381350 |
| 12 | 955187033 |
| 13 | 3272875935 |
| 14 | 11024814945 |
| 15 | 36584603310 |
| 16 | 119796766005 |
| 17 | 387639512331 |
| 18 | 1240994295715 |
| 19 | 3934750789180 |