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 | 0 |
| 5 | -3 |
| 6 | 1 |
| 7 | 3 |
| 8 | 6 |
| 9 | -6 |
| 10 | 1 |
| 11 | -12 |
| 12 | -9 |
| 13 | 26 |
| 14 | -10 |
| 15 | 1 |
| 16 | 45 |
| 17 | 3 |
| 18 | -109 |
| 19 | 71 |
| 20 | -15 |
| 21 | 1 |
| 22 | -198 |
| 23 | 81 |
| 24 | 501 |
| 25 | -475 |
| 26 | 155 |
| 27 | -21 |
| 28 | 1 |
| 29 | 1071 |
| 30 | -786 |
| 31 | -2663 |
| 32 | 3329 |
| 33 | -1455 |
| 34 | 295 |
| 35 | -28 |
| 36 | 1 |
| 37 | -6984 |
| 38 | 6711 |
| 39 | 16510 |
| 40 | -25495 |
| 41 | 13729 |
| 42 | -3647 |
| 43 | 511 |
| 44 | -36 |
| 45 | 1 |
| 46 | 53217 |
| 47 | -60309 |
| 48 | -117912 |
| 49 | 216004 |
| 50 | -135961 |
| 51 | 43897 |
| 52 | -7994 |
| 53 | 826 |
| 54 | -45 |
| 55 | 1 |
| 56 | -462330 |
| 57 | 589197 |
| 58 | 953711 |