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 | -7 |
| 3 | -23 |
| 4 | 49 |
| 5 | 401 |
| 6 | 41 |
| 7 | -5767 |
| 8 | -11423 |
| 9 | 65569 |
| 10 | 299353 |
| 11 | -441847 |
| 12 | -5511791 |
| 13 | -3665999 |
| 14 | 79937417 |
| 15 | 212712857 |
| 16 | -861871423 |
| 17 | -5076450239 |
| 18 | 3966949049 |
| 19 | 89482678313 |
| 20 | 110424995569 |
| 21 | -1233175514671 |
| 22 | -4202194115863 |
| 23 | 11830822055353 |
| 24 | 91629438996001 |
| 25 | -13485315511199 |