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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 0 |
| 5 | 74 |
| 6 | 673 |
| 7 | 5851 |
| 8 | 50977 |
| 9 | 451608 |
| 10 | 4048657 |
| 11 | 36675547 |
| 12 | 335269867 |
| 13 | 3087739250 |
| 14 | 28615970101 |
| 15 | 266630103368 |
| 16 | 2495975596632 |