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A208711 Number of 4Xn 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors 1
8, 128, 1372, 16084, 185344, 2142580, 24754628, 286034292, 3305009328, 38188137788, 441249345280, 5098468022268, 58910854227068, 680692462409636, 7865141904908344, 90878716312611076, 1050068921631026592 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A208709

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +31*a(n-2) -11*a(n-3) -71*a(n-4) -a(n-5) +38*a(n-6) -8*a(n-7) for n>9

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A303471 A301998 A105094 * A242355 A305519 A316956

Adjacent sequences:  A208708 A208709 A208710 * A208712 A208713 A208714

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 01 2012

STATUS

approved

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Last modified April 9 07:30 EDT 2020. Contains 333344 sequences. (Running on oeis4.)