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 | 10 |
| 1 | 210 |
| 2 | 2992 |
| 3 | 37100 |
| 4 | 433620 |
| 5 | 4928798 |
| 6 | 55237824 |
| 7 | 614451348 |
| 8 | 6807871480 |
| 9 | 75275707584 |
| 10 | 831595048320 |
| 11 | 9185000522880 |
| 12 | 101470031154352 |
| 13 | 1121497913694390 |
| 14 | 12403035430713344 |
| 15 | 137266650274351716 |