A218878 Number of components of the poset Sigma(n) arising from classification of primitive integral triangles with rectangular defect n.

2, 1, 1, 2, 1, 1, 2, 2, 3, 1, 1, 2, 1, 2, 2, 4, 2, 1, 1, 2, 2, 1, 2, 4, 5, 1, 1, 2, 1, 2, 2, 2, 3, 3, 2, 4, 2, 1, 2, 4, 2, 2, 1, 2, 2, 2, 2, 4, 8, 1, 2

Offset

1,1

Links

Table of n, a(n) for n=1..51.

Andy Miller, Trees of integral triangles with given rectangular defect, Discrete Math., 313 (2012), 50-66.

Crossrefs

Cf. A218879.

Sequence in context: A161043 A029316 A104368 * A364137 A240061 A162320

Adjacent sequences: A218875 A218876 A218877 * A218879 A218880 A218881

Keyword

nonn

Author

N. J. A. Sloane, Nov 26 2012

Status

approved