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A303881 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero. 0
1, 4, 11, 166, 1150, 24985, 308271, 7577931, 148783767, 4946437814, 177760275047 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303888.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

..0..1..1..0..0. .0..1..0..1..1. .0..1..0..1..1. .0..1..0..0..1

..1..0..0..1..1. .0..1..1..0..0. .0..1..1..0..0. .0..1..1..1..0

..1..0..0..1..1. .0..1..1..0..0. .0..1..1..0..0. .0..1..1..1..1

..1..0..0..1..1. .1..1..1..0..0. .0..1..1..0..0. .0..1..1..1..0

..0..1..0..1..1. .0..1..0..1..1. .0..1..1..0..0. .0..1..0..0..1

CROSSREFS

Cf. A303888.

Sequence in context: A006248 A119571 A089920 * A305277 A118197 A092658

Adjacent sequences:  A303878 A303879 A303880 * A303882 A303883 A303884

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 02 2018

STATUS

approved

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)