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 | 36 |
| 3 | 2925 |
| 4 | 1663740 |
| 5 | 6774333588 |
| 6 | 204208594169580 |
| 7 | 47025847059877940202 |
| 8 | 84798009611754271531960140 |
| 9 | 1219731290030242386267605060168700 |
| 10 | 141916030352038369973126553950792759280336 |