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 | 1 |
| 2 | 20 |
| 3 | 972 |
| 4 | 90624 |
| 5 | 13828125 |
| 6 | 3133930176 |
| 7 | 988501957072 |
| 8 | 414139067400192 |
| 9 | 222497518123837665 |
| 10 | 149143419250000000000 |
| 11 | 122020951254446884154196 |
| 12 | 119671520043865789861724160 |
| 13 | 138593796657903100873209121453 |