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A304127 Number of n X n 0..1 arrays with every element unequal to 0, 1, 3 or 6 king-move adjacent elements, with upper left element zero. 0
1, 5, 9, 44, 176, 651, 2945, 14708, 79188, 495071, 3628565, 29134749, 265855219, 2732640025, 30998016185, 398665350465 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304133.

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304133.

Sequence in context: A123822 A226065 A321718 * A220518 A145031 A121724

Adjacent sequences:  A304124 A304125 A304126 * A304128 A304129 A304130

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 07 2018

STATUS

approved

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Last modified June 22 11:59 EDT 2021. Contains 345375 sequences. (Running on oeis4.)