A269057 Number of 6Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

729, 8586, 90450, 1350672, 17696520, 242861616, 3193266318, 42102137568, 545920367142, 7046149966992, 90162767011920, 1148006491599288, 14536545425942976, 183300000374262900, 2302096893418466826

Offset: 1

Author

R. H. Hardin, Feb 18 2016

Keywords

• nonn

Comments

Row 6 of A269052.

Examples

			Some solutions for n=3
..1..1..2. .1..0..1. .0..0..0. .0..0..2. .1..2..1. .2..0..0. .0..0..1
..2..2..2. .0..0..1. .1..0..0. .0..1..0. .1..2..1. .0..1..0. .1..0..0
..1..2..1. .1..0..0. .1..0..0. .0..0..0. .1..2..2. .0..1..0. .1..0..1
..2..2..2. .0..0..1. .1..2..1. .1..0..0. .1..0..1. .2..1..2. .1..0..1
..1..2..1. .0..1..0. .1..2..1. .1..0..1. .0..0..0. .2..2..2. .1..0..1
..2..2..2. .0..0..0. .2..2..1. .1..2..1. .0..1..0. .2..2..2. .1..0..1
		

Links

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

Crossrefs

Cf. A269052.

Formula

Empirical: a(n) = 12*a(n-1) +182*a(n-2) -1820*a(n-3) -15113*a(n-4) +101664*a(n-5) +646022*a(n-6) -3003324*a(n-7) -15725808*a(n-8) [phone]*a(n-9) [phone]*a(n-10) -698528578*a(n-11) -2270736611*a(n-12) [phone]*a(n-13) [phone]*a(n-14) -41434331996*a(n-15) -62768577651*a(n-16) [phone]*a(n-17) [phone]*a(n-18) -669462409316*a(n-19) -305019512324*a(n-20) [phone]*a(n-21) [phone]*a(n-22) -2942270801898*a(n-23) [phone]*a(n-24) [phone]*a(n-25) -923967990222*a(n-26) -3689384232910*a(n-27) [phone]*a(n-28) [phone]*a(n-29) -1127033659748*a(n-30) -1366254718948*a(n-31) [phone]*a(n-32) [phone]*a(n-33) -269727615782*a(n-34) -146010681184*a(n-35) [phone]*a(n-36) [phone]*a(n-37) -15160113967*a(n-38) -3964319226*a(n-39) [phone]*a(n-40) [phone]*a(n-41) -170267256*a(n-42) -18138336*a(n-43) +8296524*a(n-44) +408240*a(n-45) -176400*a(n-46) for n>48