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 | 80 |
| 2 | 3520 |
| 3 | 112640 |
| 4 | 2928640 |
| 5 | 65601536 |
| 6 | 1312030720 |
| 7 | 23991418880 |
| 8 | 407854120960 |
| 9 | 6525665935360 |
| 10 | 99190122217472 |
| 11 | 1442765414072320 |
| 12 | 20198715797012480 |
| 13 | 273459536944168960 |
| 14 | 3594039628409077760 |
| 15 | 46003707243636195328 |
| 16 | 575046340545452441600 |
| 17 | 7035861107850241638400 |