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 | 3 |
| 2 | 39 |
| 3 | 2109 |
| 4 | 417153 |
| 5 | 346720179 |
| 6 | 1233891662727 |
| 7 | 17484682043488557 |
| 8 | 1077565432934756756289 |
| 9 | 290674711165255613845226787 |
| 10 | 320439909778519092353160948081831 |
| 11 | 1554385919734090411686737202215725913181 |
| 12 | 33245671345010828575975932818988836416481765697 |