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 | -11 |
| 2 | -23 |
| 3 | 3421 |
| 4 | 13777 |
| 5 | -3946811 |
| 6 | -23818823 |
| 7 | 9662765101 |
| 8 | 77747254177 |
| 9 | -40597653164651 |
| 10 | -408311621397623 |
| 11 | 260621490978697981 |
| 12 | 3145444161956190577 |
| 13 | -2372776776728647969691 |
| 14 | -33409916827040236064423 |
| 15 | 29080297194139431470874061 |
| 16 | 467960606621237943982982977 |