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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 262 |
| 5 | 21496 |
| 6 | 6433336 |
| 7 | 7566317200 |
| 8 | 35247649746352 |
| 9 | 648839620390462336 |
| 10 | 47230175230392839683456 |
| 11 | 13617860445102311268975051520 |
| 12 | 15577054031612736747163633737901312 |