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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 0 |
| 10 | -9 |
| 11 | -54 |
| 12 | -219 |
| 13 | -714 |
| 14 | -2001 |
| 15 | -5004 |
| 16 | -11439 |
| 17 | -24309 |
| 18 | -48618 |
| 19 | -92358 |
| 20 | -167769 |
| 21 | -292599 |
| 22 | -490104 |
| 23 | -783540 |
| 24 | -1172907 |
| 25 | -1562274 |
| 26 | -1562274 |
| 27 | 0 |
| 28 | 6216183 |
| 29 | 24581880 |
| 30 | 72182016 |
| 31 | 186061536 |
| 32 | 443185425 |
| 33 | 997483653 |
| 34 | 2146130559 |
| 35 | 4443424371 |
| 36 | 8886848742 |