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A301966 Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
8, 34, 40, 64, 111, 219, 443, 904, 1860, 3856, 8015, 16659, 34647, 72088, 150004, 312144, 649555, 1351723, 2812951, 5853784, 12181816, 25350576, 52755019, 109784179, 228462939, 475435704, 989390720, 2058940864, 4284695031 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A301964.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +a(n-3) -a(n-4) -2*a(n-6) +a(n-7) for n>9

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A301964.

Sequence in context: A299191 A300027 A301793 * A196143 A307091 A024847

Adjacent sequences:  A301963 A301964 A301965 * A301967 A301968 A301969

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 29 2018

STATUS

approved

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Last modified September 19 05:33 EDT 2020. Contains 337176 sequences. (Running on oeis4.)