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Table of n, a(n) for n=0..72.
R. K. Guy, My favorite elliptic curve: a tale of two types of triangles, Amer. Math. Monthly, 102 (1995), 771-781.
Sequence in context: A158572 A083532 A073366 * A105283 A244891 A123019
Adjacent sequences: A001083 A001084 A001085 * A001087 A001088 A001089
N. J. A. Sloane, R. K. Guy