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

1,12

Links

Table of n, a(n) for n=1..71.

Formula

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

Crossrefs

Cf. A009023, A055523.

Sequence in context: A373976 A369164 A370815 * A332602 A306383 A376364

Adjacent sequences: A056134 A056135 A056136 * A056138 A056139 A056140

Keyword

nonn

Author

Henry Bottomley, Jun 15 2000

Status

approved