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 | -15 |
| 2 | 280 |
| 3 | -6818 |
| 4 | 211419 |
| 5 | -8140201 |
| 6 | 381046666 |
| 7 | -21311675172 |
| 8 | 1403560732197 |
| 9 | -107511088907411 |
| 10 | 9477041183699628 |
| 11 | -952543229948336246 |
| 12 | 108287370047760742687 |
| 13 | -13824473678516613263949 |
| 14 | 1969401123093628097438846 |
| 15 | -311285602459098858965568152 |
| 16 | 54311579841579438918099328713 |