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A067675 Number of fixed convex polyominoes with n cells. 6
1, 2, 6, 19, 59, 176, 502, 1374, 3630, 9312, 23320, 57279, 138536, 331032, 783630, 1841867, 4306172, 10028276, 23288394, 53974959, 124925967, 288878550, 667602492, 1542254655, 3562000916, 8225719574 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Ruben Grønning Spaans, Table of n, a(n) for n = 1..1000

Gadi Aleksandrowicz, Andrei Asinowski and Gill Barequet, A polyominoes-permutations injection and tree-like convex polyominoes, Journal of Combinatorial Theory, Series A, Volume 119, Issue 3, April 2012, Pages 503-520.

M. Bousquet-Mélou and J.-M. Fédou, The generating function of convex polyominoes: the resolution of a q-differential system, Discrete Math. 137 (1995) 53-75.

Ruben Grønning Spaans, C program

V. M. Zhuravlev, Horizontally-convex polyiamonds and their generating functions, Mat. Pros. 17 (2013), 107-129 (in Russian).

FORMULA

a(n) ~ c * d^n, where d = A276994 = 2.309138593330494731098720305017212531911814472581628401694402900284456440748..., c = 2.91959850971360705538470951565133568591516894147305658630679268977185945... . - Vaclav Kotesovec, Sep 27 2016

CROSSREFS

Cf. A006958, A067676 (fixed directed convex polyominoes), A191148 (fixed line-convex polycubes in 3 dimensions), A276994.

Sequence in context: A307564 A308240 A328658 * A037512 A111277 A014346

Adjacent sequences:  A067672 A067673 A067674 * A067676 A067677 A067678

KEYWORD

nonn

AUTHOR

Steven Finch, Feb 04 2002

EXTENSIONS

Six more terms from Ruben Grønning Spaans, Sep 20 2014

STATUS

approved

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Last modified December 1 10:49 EST 2021. Contains 349428 sequences. (Running on oeis4.)