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 | 6 |
| 2 | 46 |
| 3 | 450 |
| 4 | 5650 |
| 5 | 91866 |
| 6 | 1957066 |
| 7 | 55363650 |
| 8 | 2109599650 |
| 9 | 109773407466 |
| 10 | 7894945079386 |
| 11 | 792252362302770 |
| 12 | 111671194813402930 |
| 13 | 22202849561274787866 |
| 14 | 6241728810901739517226 |
| 15 | 2484011055161613143144610 |
| 16 | 1400187830319472451472442690 |