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 | 275 |
| 3 | -6289 |
| 4 | 92902541 |
| 5 | -154473289 |
| 6 | 13399738273333 |
| 7 | -377635608584803 |
| 8 | 822223497000264427 |
| 9 | -1492945924219675973 |
| 10 | 1323386773861946436609781 |
| 11 | -2448418399924413951578983 |
| 12 | 177825546947844845937070681472647 |