

A056844


Number of polydiamonds: polyominoes made from n diamonds.


2




OFFSET

1,2


COMMENTS

Comment from Larry_Reeves(AT)intranetsolutions.com, Jun 22 2001: If you look at Vicher's picture of the 40 4celled polydiamonds (link in A056844), near the middle of the picture is a polydiamond that looks like the traditional 2D representation of a cube with an extra diamond stuck to the edge. Depending on how you orient the cube, there are actually 2 different ways to form this polydiamond, although there is no change in the perimeter shape. I haven't confirmed that this explains the difference in values for sizes 5 and above for A056844 and A056845, but it looks like a possible explanation.


LINKS

Table of n, a(n) for n=1..6.
M. Vicher, Polyforms
M. Vicher, The 40 4celled polydiamonds
M. Vicher, The 40 4celled polydiamonds


CROSSREFS

Cf. A056845.
Sequence in context: A261047 A052846 A293152 * A220471 A213095 A238372
Adjacent sequences: A056841 A056842 A056843 * A056845 A056846 A056847


KEYWORD

nice,nonn,more


AUTHOR

James A. Sellers, Aug 28 2000


EXTENSIONS

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


STATUS

approved



