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 | 3 |
| 3 | 2 |
| 4 | -418 |
| 5 | -14676 |
| 6 | -234344 |
| 7 | 18565056 |
| 8 | 2659703616 |
| 9 | 169046742960 |
| 10 | -6539356064736 |
| 11 | -4061128974843744 |
| 12 | -672969012637199040 |
| 13 | -19289566159655581440 |
| 14 | 27323548725052131528960 |
| 15 | 10157639436460221570630144 |
| 16 | 1433264952547826545065237504 |
| 17 | -520046813680980959472490690560 |