A304769 - OEIS

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A304769

Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 7 king-move adjacent elements, with upper left element zero.

1, 8, 27, 172, 1581, 23872, 540901, 26814986, 2642187354, 423954813814, 137504464857165, 84534178018042998, 91922192531872367978

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Diagonal of A304775.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304775.

Sequence in context: A165048 A066963 A067813 * A118720 A197620 A029786

Adjacent sequences: A304766 A304767 A304768 * A304770 A304771 A304772

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 18 2018

STATUS

approved