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 | 4 |
| 2 | 64 |
| 3 | 1778 |
| 4 | 73848 |
| 5 | 4188592 |
| 6 | 306690520 |
| 7 | 27893327856 |
| 8 | 3063657097664 |
| 9 | 397720778283584 |
| 10 | 59997757426314624 |
| 11 | 10373545999796847232 |
| 12 | 2032368096229682220160 |
| 13 | 446879795164524710777856 |