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 | 1 |
| 1 | 16 |
| 2 | 240 |
| 3 | 3600 |
| 4 | 53776 |
| 5 | 803504 |
| 6 | 11994096 |
| 7 | 179054640 |
| 8 | 2672126256 |
| 9 | 39878886896 |
| 10 | 595065468048 |
| 11 | 8879592484240 |
| 12 | 132491660323472 |
| 13 | 1976912303612080 |
| 14 | 29496313445323888 |
| 15 | 440098575225868624 |
| 16 | 6566302628140689744 |
| 17 | 97969968518462054352 |
| 18 | 1461698348385616122224 |