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 | 3 |
| 5 | 0 |
| 6 | -6 |
| 7 | 17 |
| 8 | -17 |
| 9 | -19 |
| 10 | 114 |
| 11 | -215 |
| 12 | 111 |
| 13 | 609 |
| 14 | -2084 |
| 15 | 2947 |
| 16 | 1187 |
| 17 | -16252 |
| 18 | 38872 |
| 19 | -32709 |
| 20 | -87431 |
| 21 | 390618 |
| 22 | -673709 |
| 23 | 47692 |
| 24 | 3018098 |
| 25 | -8616766 |
| 26 | 9761812 |
| 27 | 13605710 |
| 28 | -84546525 |
| 29 | 171930010 |
| 30 | -77194029 |
| 31 | -610108400 |
| 32 | 2090199824 |
| 33 | -2940478260 |
| 34 | -1840404119 |
| 35 | 19501756943 |
| 36 | -46202080484 |