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 | -2 |
| 4 | 3 |
| 5 | -3 |
| 6 | 4 |
| 7 | -6 |
| 8 | 8 |
| 9 | -10 |
| 10 | 12 |
| 11 | -16 |
| 12 | 21 |
| 13 | -25 |
| 14 | 30 |
| 15 | -38 |
| 16 | 48 |
| 17 | -57 |
| 18 | 68 |
| 19 | -84 |
| 20 | 102 |
| 21 | -121 |
| 22 | 143 |
| 23 | -172 |
| 24 | 207 |
| 25 | -243 |
| 26 | 284 |
| 27 | -338 |
| 28 | 400 |
| 29 | -465 |
| 30 | 542 |
| 31 | -636 |
| 32 | 744 |
| 33 | -862 |
| 34 | 996 |
| 35 | -1158 |
| 36 | 1344 |
| 37 | -1546 |
| 38 | 1776 |
| 39 | -2050 |
| 40 | 2361 |
| 41 | -2701 |
| 42 | 3088 |
| 43 | -3540 |
| 44 | 4050 |
| 45 | -4613 |
| 46 | 5248 |
| 47 | -5980 |
| 48 | 6808 |
| 49 | -7719 |
| 50 | 8742 |
| 51 | -9916 |
| 52 | 11232 |
| 53 | -12682 |