A039620 Erroneous version of A008296.
1, 1, 1, -1, 3, 1, 2, -1, 6, 1, -6, 0, 4, 5, 10, 1, 24, 4, -15, 25, 15, 1, -120, -28, 49, -35
Offset: 1
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.