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A281949 Number of nX2 0..1 arrays with no element unequal to more than four of its king-move neighbors and with new values introduced in order 0 sequentially upwards. 8
2, 8, 30, 112, 420, 1576, 5912, 22176, 83184, 312032, 1170464, 4390528, 16469312, 61778048, 231735680, 869263872, 3260696320, 12231200256, 45880463872, 172102240256, 645572834304, 2421608712192, 9083698141184, 34073866477568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A281955.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) -2*a(n-2) +4*a(n-3)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A281955.

Sequence in context: A077839 A052530 A274798 * A162551 A073663 A266319

Adjacent sequences:  A281946 A281947 A281948 * A281950 A281951 A281952

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 03 2017

STATUS

approved

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Last modified May 26 00:04 EDT 2019. Contains 323576 sequences. (Running on oeis4.)