A056137 Number of ways in which n can be the longer leg (middle side) of an integer-sided right triangle.

0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 3, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 2, 0, 0, 0, 2, 0, 1, 0, 1, 2, 0, 0, 3, 0, 0, 0, 1, 0, 0, 1, 2, 0, 0, 0, 4, 0, 0, 2, 1, 0, 0, 0, 1, 0, 1, 0

Offset: 1

Author

Henry Bottomley, Jun 15 2000

Keywords

• nonn

Crossrefs

Cf. A009023, A055523.

Formula

a(n) = A046079(n) - A056138(n) = A046081(n) - A046080(n) - A056138(n).