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 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 9 |
| 6 | 7 |
| 7 | -7 |
| 8 | -57 |
| 9 | -199 |
| 10 | -569 |
| 11 | -1479 |
| 12 | -3641 |
| 13 | -8647 |
| 14 | -20025 |
| 15 | -45511 |
| 16 | -101945 |
| 17 | -225735 |
| 18 | -495161 |
| 19 | -1077703 |
| 20 | -2330169 |
| 21 | -5009863 |
| 22 | -10718777 |
| 23 | -22835655 |
| 24 | -48467513 |
| 25 | -102527431 |
| 26 | -216239673 |
| 27 | -454848967 |
| 28 | -954437177 |
| 29 | -1998352839 |
| 30 | -4175662649 |
| 31 | -8709239239 |