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 | -2 |
| 3 | -1 |
| 4 | -1 |
| 5 | 3 |
| 6 | 3 |
| 7 | 9 |
| 8 | 9 |
| 9 | 10 |
| 10 | 8 |
| 11 | -1 |
| 12 | -21 |
| 13 | -45 |
| 14 | -77 |
| 15 | -130 |
| 16 | -163 |
| 17 | -198 |
| 18 | -179 |
| 19 | -108 |
| 20 | 101 |
| 21 | 451 |
| 22 | 1058 |
| 23 | 1878 |
| 24 | 2999 |
| 25 | 4276 |
| 26 | 5595 |
| 27 | 6511 |
| 28 | 6446 |
| 29 | 4443 |
| 30 | -838 |
| 31 | -11069 |
| 32 | -28373 |
| 33 | -54652 |
| 34 | -91948 |
| 35 | -140370 |
| 36 | -198501 |
| 37 | -259706 |
| 38 | -311997 |
| 39 | -332003 |
| 40 | -285486 |
| 41 | -118600 |
| 42 | 239086 |
| 43 | 881998 |
| 44 | 1918851 |
| 45 | 3470261 |