A086782 Sum of the degrees of the irreducible representations of the group GL(3,Z_n).
1, 28, 468, 1876, 12400, 13104, 100548
Offset: 1
Formula
For a prime p : a(p) = phi(p^3)*(p^3 - 1) = p^2*(p-1)^2*(p^2+p+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.
[Nclasses(GeneralLinearGroup(4, ResidueClassRing(n))) : n in [2..15]];