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A120891
Number of primitive Pythagorean triangles with odd leg 2n-1.
2
0, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 4, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 2, 2, 1, 4, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 4, 1, 1, 2, 2
OFFSET
1,8
COMMENTS
Bisection of A024361.
Bisection of even-numbered terms of A024361 results in alternating zero terms; removing zeros gives A068068. - Ray Chandler, Feb 04 2020
LINKS
FORMULA
a(n)=2^(k-1), where k=A092523(n) for n > 1.
CROSSREFS
KEYWORD
nonn
AUTHOR
Lekraj Beedassy, Jul 12 2006
EXTENSIONS
a(1)=0 inserted by Ray Chandler, Feb 04 2020
STATUS
approved