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 | 42 |
| 2 | 706 |
| 3 | -59220 |
| 4 | -4728084 |
| 5 | 52039512 |
| 6 | 27197223864 |
| 7 | 811936580112 |
| 8 | -167321303572080 |
| 9 | -13899725964095328 |
| 10 | 1009444962121341984 |
| 11 | 189455789109224933568 |
| 12 | -3790777326580730799936 |
| 13 | -2564543346247110450176640 |
| 14 | -55572469192587267485099136 |
| 15 | 35651972338523534753642227968 |