RIOPLATENSE 1992 Problem 2

Determine the integers $0 \le a \le b \le c \le d$ such that: $2^n= a^2 + b^2 + c^2 + d^2.$

Dataset text AI-MO AoPS. Quoted with source.

Solutions

No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.