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A186586 Number of (n+3)X9 0..2 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock 1
1728546, 79015, 149305, 328891, 626233, 811795, 823249, 841075, 880969, 1019683, 1221265, 1504507, 2353993, 3537235, 4869121, 7110411, 10563977, 14962483, 20061441, 27545691, 39153465, 55017603, 74946417, 104128395, 148464553 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A186589

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..78

FORMULA

Empirical: a(n)=2*a(n-1)-a(n-2)+2*a(n-4)-4*a(n-5)+2*a(n-6)+2*a(n-8)-2*a(n-9) for n>16

EXAMPLE

Some solutions for 5X9

..0..0..0..0..0..0..0..2..0....0..0..0..0..0..0..2..0..1

..0..0..0..0..0..0..0..0..1....0..0..0..0..0..0..0..0..2

..2..0..0..0..0..0..0..0..2....1..0..0..0..0..0..0..0..0

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

..1..1..0..0..0..0..0..0..0....2..0..1..0..0..0..0..0..0

CROSSREFS

Sequence in context: A083646 A157858 A157862 * A131639 A187139 A185844

Adjacent sequences:  A186583 A186584 A186585 * A186587 A186588 A186589

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 24 2011

STATUS

approved

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Last modified December 7 09:33 EST 2019. Contains 329843 sequences. (Running on oeis4.)