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A204543 Number of (n+1)X2 0..1 arrays with permanents of 2X2 subblocks differing from neighboring permanents 1
16, 26, 41, 56, 80, 112, 162, 224, 322, 448, 646, 896, 1290, 1792, 2582, 3584, 5162, 7168, 10326, 14336, 20650, 28672, 41302, 57344, 82602, 114688, 165206, 229376, 330410, 458752, 660822, 917504, 1321642, 1835008, 2643286, 3670016, 5286570 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

Empirical: a(n) = a(n-2) +2*a(n-4) for n>6

Empirical: a(2k)=14*2^k for k>1

EXAMPLE

Some solutions for n=8

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

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

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

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

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

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

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

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

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

CROSSREFS

Even terms are A005009(n/2+1) for n>=4

Sequence in context: A166672 A167358 A171144 * A155549 A064420 A038353

Adjacent sequences:  A204540 A204541 A204542 * A204544 A204545 A204546

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 16 2012

STATUS

approved

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Last modified December 22 19:34 EST 2014. Contains 252365 sequences.