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 | -3 |
| 4 | 7 |
| 5 | -11 |
| 6 | 17 |
| 7 | -23 |
| 8 | 31 |
| 9 | -39 |
| 10 | 49 |
| 11 | -59 |
| 12 | 71 |
| 13 | -83 |
| 14 | 97 |
| 15 | -111 |
| 16 | 127 |
| 17 | -143 |
| 18 | 161 |
| 19 | -179 |
| 20 | 199 |
| 21 | -219 |
| 22 | 241 |
| 23 | -263 |
| 24 | 287 |
| 25 | -311 |
| 26 | 337 |
| 27 | -363 |
| 28 | 391 |
| 29 | -419 |
| 30 | 449 |
| 31 | -479 |
| 32 | 511 |
| 33 | -543 |
| 34 | 577 |
| 35 | -611 |
| 36 | 647 |
| 37 | -683 |
| 38 | 721 |
| 39 | -759 |
| 40 | 799 |
| 41 | -839 |
| 42 | 881 |
| 43 | -923 |
| 44 | 967 |
| 45 | -1011 |
| 46 | 1057 |
| 47 | -1103 |
| 48 | 1151 |
| 49 | -1199 |
| 50 | 1249 |
| 51 | -1299 |
| 52 | 1351 |
| 53 | -1403 |
| 54 | 1457 |
| 55 | -1511 |
| 56 | 1567 |
| 57 | -1623 |
| 58 | 1681 |
| 59 | -1739 |
| 60 | 1799 |
| 61 | -1859 |
| 62 | 1921 |
| 63 | -1983 |
| 64 | 2047 |
| 65 | -2111 |
| 66 | 2177 |
| 67 | -2243 |
| 68 | 2311 |
| 69 | -2379 |
| 70 | 2449 |
| 71 | -2519 |
| 72 | 2591 |
| 73 | -2663 |
| 74 | 2737 |
| 75 | -2811 |