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A238650 Number of (n+2)X(4+2) 0..1 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors, and new values 0..1 introduced in row major order 1
5, 50, 189, 1015, 4742, 23373, 112827, 549068, 2663629, 12937577, 62809544, 304985137, 1480814097, 7190093330, 34911122149, 169509843307, 823048304238, 3996280864977, 19403790420427, 94214378731132, 457454375449573 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A238654

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +12*a(n-2) +a(n-3) -58*a(n-4) -115*a(n-5) +83*a(n-6) +312*a(n-7) +120*a(n-8) -336*a(n-9) -348*a(n-10) +420*a(n-11) +104*a(n-12) -194*a(n-13) +43*a(n-14) +35*a(n-15) -42*a(n-16) -3*a(n-17) +14*a(n-18) -a(n-19) -a(n-20)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A274067 A069540 A267640 * A281606 A061160 A226548

Adjacent sequences:  A238647 A238648 A238649 * A238651 A238652 A238653

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 02 2014

STATUS

approved

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Last modified December 8 08:31 EST 2021. Contains 349594 sequences. (Running on oeis4.)