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 | 8 |
| 3 | 154 |
| 4 | 5690 |
| 5 | 346366 |
| 6 | 31540898 |
| 7 | 4022618734 |
| 8 | 685081183970 |
| 9 | 150294263931406 |
| 10 | 41295554517419138 |
| 11 | 13894282169096540014 |
| 12 | 5619799582929595762850 |
| 13 | 2690722557848361804976846 |
| 14 | 1505284957795131345177533378 |
| 15 | 973008827731313629949682056494 |