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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | 2 |
| 5 | -3 |
| 6 | 1 |
| 7 | -7 |
| 8 | 12 |
| 9 | -6 |
| 10 | 1 |
| 11 | 39 |
| 12 | -70 |
| 13 | 40 |
| 14 | -10 |
| 15 | 1 |
| 16 | -321 |
| 17 | 585 |
| 18 | -350 |
| 19 | 100 |
| 20 | -15 |
| 21 | 1 |
| 22 | 3681 |
| 23 | -6741 |
| 24 | 4095 |
| 25 | -1225 |
| 26 | 210 |
| 27 | -21 |
| 28 | 1 |
| 29 | -56197 |
| 30 | 103068 |
| 31 | -62916 |
| 32 | 19110 |
| 33 | -3430 |
| 34 | 392 |
| 35 | -28 |
| 36 | 1 |
| 37 | 1102571 |
| 38 | -2023092 |
| 39 | 1236816 |
| 40 | -377496 |
| 41 | 68796 |
| 42 | -8232 |
| 43 | 672 |
| 44 | -36 |
| 45 | 1 |
| 46 | -27036487 |
| 47 | 49615695 |
| 48 | -30346380 |
| 49 | 9276120 |
| 50 | -1698732 |
| 51 | 206388 |