0,3

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a(4)= a(0)^2 a(3)^2 +a(1)^2 a(2)^2 +a(2)^2 a(1)^2 +a(3)^2 a(0)^2= 1^2 *9^2 +1^2 *2^2 +2^2 *1^2 +9^2 *1^2= 170

Sequence in context: A133468 A081459 A038843 this_sequence A078524 A041795 A123625

Adjacent sequences: A053291 A053292 A053293 this_sequence A053295 A053296 A053297

nonn

Leroy Quet Mar 04 2000