Numbers n such that triangular(n) + triangular(2*n) is a triangular number.

A225785

Numbers n such that triangular(n) + triangular(2*n) is a triangular number.

Terms

    a(0) =0a(1) =12a(2) =84a(3) =3960a(4) =27144a(5) =1275204a(6) =8740380a(7) =410611824a(8) =2814375312a(9) =132215732220a(10) =906220110180

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