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 | 2 |
| 1 | -3 |
| 2 | 12 |
| 3 | -28 |
| 4 | 77 |
| 5 | -198 |
| 6 | 522 |
| 7 | -1363 |
| 8 | 3572 |
| 9 | -9348 |
| 10 | 24477 |
| 11 | -64078 |
| 12 | 167762 |
| 13 | -439203 |
| 14 | 1149852 |
| 15 | -3010348 |
| 16 | 7881197 |
| 17 | -20633238 |
| 18 | 54018522 |
| 19 | -141422323 |
| 20 | 370248452 |
| 21 | -969323028 |
| 22 | 2537720637 |
| 23 | -6643838878 |
| 24 | 17393796002 |
| 25 | -45537549123 |
| 26 | 119218851372 |
| 27 | -312119004988 |
| 28 | 817138163597 |