A269017 Number of 7Xn binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

0, 1183, 22654, 566656, 10002542, 192100836, 3258530608, 56916559941, 940858829922, 15693717431672, 254647316356204, 4136953520012344, 66194476183413344, 1057401264518371179, 16737766253590304358

Offset: 1

Author

R. H. Hardin, Feb 17 2016

Keywords

• nonn

Comments

Row 7 of A269011.

Examples

			Some solutions for n=3
..0..1..0. .0..0..1. .0..1..0. .1..1..0. .1..1..0. .0..0..0. .1..0..1
..0..0..0. .1..0..0. .0..1..0. .0..0..0. .0..0..0. .0..1..0. .1..0..1
..0..1..0. .1..0..0. .0..0..0. .0..1..0. .0..0..0. .0..0..0. .0..0..0
..1..0..0. .1..0..0. .0..1..0. .0..0..0. .0..0..1. .1..0..1. .1..0..0
..0..0..1. .1..0..0. .0..1..0. .0..0..0. .0..0..1. .0..0..1. .0..0..0
..0..0..1. .1..0..0. .0..0..0. .0..1..0. .0..0..0. .0..0..0. .0..1..0
..1..0..1. .0..1..0. .1..1..0. .0..0..0. .0..1..0. .1..1..0. .0..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A269011.

Formula

Empirical: a(n) = 18*a(n-1) +287*a(n-2) -5714*a(n-3) -26548*a(n-4) +662854*a(n-5) +503265*a(n-6) -36588730*a(n-7) [phone]*a(n-8) [phone]*a(n-9) -2531478280*a(n-10) -16536573196*a(n-11) [phone]*a(n-12) [phone]*a(n-13) -653413097167*a(n-14) -674041638674*a(n-15) [phone]*a(n-16) [phone]*a(n-17) -20672353979137*a(n-18) [phone]*a(n-19) [phone]*a(n-20) -34583201988384*a(n-21) -101896578743152*a(n-22) [phone]*a(n-23) [phone]*a(n-24) -115277187600000*a(n-25) -52616533613760*a(n-26) [phone]*a(n-27) [phone]*a(n-28) -30037873821696*a(n-29) [phone]*a(n-30) [phone]*a(n-31) -1173876903936*a(n-32)