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 | -2 |
| 2 | -1 |
| 3 | -6 |
| 4 | -11 |
| 5 | -34 |
| 6 | -95 |
| 7 | -298 |
| 8 | -953 |
| 9 | -3158 |
| 10 | -10677 |
| 11 | -36750 |
| 12 | -128249 |
| 13 | -452774 |
| 14 | -1614049 |
| 15 | -5801654 |
| 16 | -21003739 |
| 17 | -76516994 |
| 18 | -280293319 |
| 19 | -1031794394 |
| 20 | -3814819699 |
| 21 | -14160035234 |
| 22 | -52747353739 |
| 23 | -197125162514 |
| 24 | -738866581039 |
| 25 | -2776933457162 |
| 26 | -10462759383943 |