138336

Appears in sequences

• Number of solutions to x^2 + y^2 + z^2 + t^2 == n (mod 2*n) for x,y,z,t in [0, 2*n).at n=21A229294
• Triangle read by rows: T(n,k) is the number of unlabeled simple graphs with n vertices and treedepth k.at n=41A387046