

A056755


Number of ncelled polyominoes, where the cells are 1 X 2 rectangles with some of the edges of length 2 replaced by curved arcs that either sag inwards or bulge outwards.


2




OFFSET

1,1


COMMENTS

The rules that govern which edges are changed are not completely clear, so two examples drawn by M. Vicher have been included.
Probably an erroneous version of A121194.
Row 11 of polyforms table, puzzle 1 (See link).  Omar E. Pol, Feb 22 2011.


LINKS

Table of n, a(n) for n=1..5.
M. Vicher, Polyforms
M. Vicher, The 10 2celled polyominoes
M. Vicher, The 10 2celled polyominoes
M. Vicher, The 68 3celled polyominoes
M. Vicher, The 68 3celled polyominoes


CROSSREFS

Cf. A121194.
Sequence in context: A136658 A165968 A104098 * A123617 A139715 A293914
Adjacent sequences: A056752 A056753 A056754 * A056756 A056757 A056758


KEYWORD

nonn,obsc


AUTHOR

James A. Sellers, Aug 28 2000


EXTENSIONS

Edited by N. J. A. Sloane, Jun 21 2001


STATUS

approved



