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A293261 Number of fixed polyominoes without holes that have a width and height of n. 1
1, 5, 106, 6074, 943340, 419355340, 554485727288, 2208574156731474, 26609978139626497670, 973224195603423767343946, 108342096917091380628767818812, 36763211016528549310068224122368860, 38044287043749436284594644308861499605492 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Equivalently, the number of cycles on an (n+1) X (n+1) grid that touch each of the four outside edges.

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Main diagonal of A232103.

Cf. A268404.

Sequence in context: A059490 A204109 A093979 * A142479 A204110 A113056

Adjacent sequences:  A293258 A293259 A293260 * A293262 A293263 A293264

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Oct 04 2017

STATUS

approved

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Last modified August 21 10:21 EDT 2018. Contains 313937 sequences. (Running on oeis4.)