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 | -4 |
| 3 | -5 |
| 4 | 19 |
| 5 | 119 |
| 6 | 226 |
| 7 | -789 |
| 8 | -7747 |
| 9 | -25333 |
| 10 | 29428 |
| 11 | 826059 |
| 12 | 4651651 |
| 13 | 7008499 |
| 14 | -108045466 |
| 15 | -1124213961 |
| 16 | -4968432059 |
| 17 | 6515205811 |
| 18 | 300350438716 |
| 19 | 2561696929271 |
| 20 | 9034737779711 |
| 21 | -58377397309001 |
| 22 | -1213955186657474 |
| 23 | -9784487206914505 |
| 24 | -27228229386096731 |
| 25 | 417997375131879519 |