A104438 Number of ways to split 1, 2, 3, ..., 5n into 5 arithmetic progressions each with n terms.
1, 945, 55, 23, 21, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20
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.