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 | 0 |
| 2 | -1 |
| 3 | -2 |
| 4 | 0 |
| 5 | 0 |
| 6 | -1 |
| 7 | -4 |
| 8 | -4 |
| 9 | -2 |
| 10 | -3 |
| 11 | -6 |
| 12 | -13 |
| 13 | -16 |
| 14 | -19 |
| 15 | -24 |
| 16 | -38 |
| 17 | -60 |
| 18 | -82 |
| 19 | -110 |
| 20 | -150 |
| 21 | -224 |
| 22 | -324 |
| 23 | -458 |
| 24 | -637 |
| 25 | -898 |
| 26 | -1289 |
| 27 | -1838 |
| 28 | -2609 |
| 29 | -3680 |
| 30 | -5223 |
| 31 | -7430 |
| 32 | -10571 |
| 33 | -15004 |
| 34 | -21272 |
| 35 | -30202 |
| 36 | -42903 |
| 37 | -60960 |
| 38 | -86543 |
| 39 | -122860 |
| 40 | -174450 |
| 41 | -247762 |
| 42 | -351883 |
| 43 | -499668 |
| 44 | -709521 |
| 45 | -1007532 |