A304927 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A304927

Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

1, 5, 13, 73, 452, 2653, 15993, 118024, 920997, 12184613, 162877680, 2507024025, 36984184204, 682363665419

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

OFFSET

1,2

COMMENTS

Diagonal of A304931.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304931.

Sequence in context: A137702 A140120 A303962 * A163732 A208821 A293259

Adjacent sequences: A304924 A304925 A304926 * A304928 A304929 A304930

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 21 2018

STATUS

approved