0,4

For any i,j >=0 a(i)*a(j) is a member of this sequence, since (a^2 + b^2)*(c^2 + d^2) = (a*c + b*d)^2 + (a*d - b*c)^2. - Boris Putievskiy, May 05 2013

Table of n, a(n) for n=0..63.

Diagonals (each starting on row 1): {0}; {1,1}; {4,2,4}; ...

Cf. A006331.

Sequence in context: A137718 A007361 A128136 * A203001 A051666 A011382

Adjacent sequences: A048144 A048145 A048146 * A048148 A048149 A048150

nonn,tabl

Clark Kimberling

approved