A208979 Number of primitive Heron triangles with diameter <= 2^n.

0, 0, 3, 7, 26, 78, 266, 752, 2291, 6332, 17415, 47313, 126061, 331121

Offset

1,3

References

W. D. Smith, Posting to Math Fun Mailing List, Dec 05 2011.

Links

Table of n, a(n) for n=1..14.

Crossrefs

Sequence in context: A057124 A038237 A296852 * A148740 A148741 A328280

Adjacent sequences: A208976 A208977 A208978 * A208980 A208981 A208982

Keyword

nonn

Author

N. J. A. Sloane, Mar 04 2012

Status

approved