1,3

Dissections differing only by rotations and/or reflections are not counted as distinct. - N. J. A. Sloane, Dec 06 2012

Table of n, a(n) for n=1..10.

Johan Nilsson, Illustrations of terms up to a(6).

There are six ways to dissect a square into four rectangles of equal perimeter, so a(4)=6.

Cf. A108066.

Sequence in context: A013989 A002841 A136509 * A317094 A339844 A258797

Adjacent sequences: A100661 A100662 A100663 * A100665 A100666 A100667

hard,more,nonn

Herman Beeksma and Hans Riesebos (hans.riesebos(AT)wanadoo.nl), Aug 04 2005

approved