1,1

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.

Cf. A218878.

Sequence in context: A241950 A316776 A029308 * A340381 A029259 A159266

Adjacent sequences: A218876 A218877 A218878 * A218880 A218881 A218882

nonn

N. J. A. Sloane, Nov 26 2012

approved