(x,y) = (a(n),a(n+1)) are the solutions of (t(x)+t(y))/(1+xy) = t(3) = 6, where t(n) denotes the n-th triangular number t(n) = n(n+1)/2.

A065929

(x,y) = (a(n),a(n+1)) are the solutions of (t(x)+t(y))/(1+xy) = t(3) = 6, where t(n) denotes the n-th triangular number t(n) = n(n+1)/2.

Terms

    a(0) =3a(1) =35a(2) =416a(3) =4956a(4) =59055a(5) =703703a(6) =8385380a(7) =99920856a(8) =1190664891a(9) =14188057835a(10) =169066029128

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