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 | 2 |
| 4 | -2 |
| 5 | 5 |
| 6 | -14 |
| 7 | 5 |
| 8 | 14 |
| 9 | -74 |
| 10 | 74 |
| 11 | -14 |
| 12 | 42 |
| 13 | -352 |
| 14 | 668 |
| 15 | -352 |
| 16 | 42 |
| 17 | 132 |
| 18 | -1588 |
| 19 | 4808 |
| 20 | -4808 |
| 21 | 1588 |
| 22 | -132 |
| 23 | 429 |
| 24 | -6946 |
| 25 | 30371 |
| 26 | -48540 |
| 27 | 30371 |
| 28 | -6946 |
| 29 | 429 |
| 30 | 1430 |
| 31 | -29786 |
| 32 | 176270 |
| 33 | -407810 |
| 34 | 407810 |
| 35 | -176270 |
| 36 | 29786 |
| 37 | -1430 |