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 | 2 |
| 3 | 9 |
| 4 | 78 |
| 5 | 1038 |
| 6 | 18968 |
| 7 | 443595 |
| 8 | 12681960 |
| 9 | 429244197 |
| 10 | 16801151910 |
| 11 | 746998729887 |
| 12 | 37200237947376 |
| 13 | 2051666003699226 |
| 14 | 124156748403386646 |
| 15 | 8180285024067867345 |
| 16 | 582970677419310149580 |
| 17 | 44684461723038752605932 |