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A298088 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero. 0
0, 3, 15, 30, 45, 171, 229, 417, 822, 1359, 1993, 5049, 3669, 7878, 33158, 16734, 37752, 734240, 160344, 389218, 50665319, 1735920, 6661033 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298093.

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A298093.

Sequence in context: A020493 A087183 A297851 * A290325 A271326 A106354

Adjacent sequences:  A298085 A298086 A298087 * A298089 A298090 A298091

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 12 2018

STATUS

approved

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Last modified January 22 19:45 EST 2022. Contains 350504 sequences. (Running on oeis4.)