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 A270417 Number of integer-sided right-angled triangles with semiperimeter n. 1
 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 2, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 2, 0, 0, 2, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 3, 0, 0, 1, 0, 0, 2, 0, 0, 0, 1, 0, 2, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 3, 0, 0, 0, 1, 0, 3, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 2, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,30 COMMENTS Number of positive integer solutions to x*y*(y+z)=n with y and z coprime and of opposite parity and z0 && y>0 && z>0 && zy)&&(w%2)&&(1==gcd(w, y)), s++))); (s); }; \\ (Here z = w-y) - Antti Karttunen, Sep 25 2018 CROSSREFS Cf. A010814. Nonzero for terms in A005279. Sequence in context: A291203 A256852 A128616 * A307666 A319995 A266344 Adjacent sequences:  A270414 A270415 A270416 * A270418 A270419 A270420 KEYWORD nonn AUTHOR Henry Bottomley, Mar 16 2016 STATUS approved

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Last modified July 20 01:17 EDT 2019. Contains 325168 sequences. (Running on oeis4.)