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A204718 Number of (n+1)X4 0..1 arrays with the permanents of 2X2 subblocks nondecreasing rightwards and downwards 1
156, 1271, 9657, 67518, 457635, 2995945, 19292513, 122364692, 769496369, 4805715229, 29884389399, 185240266936, 1145815170519, 7076844213885, 43664352503529, 269220210036124, 1659131569336565, 10221401510913813 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A204723

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) +12*a(n-2) -350*a(n-3) +263*a(n-4) +5188*a(n-5) -6940*a(n-6) -42704*a(n-7) +68106*a(n-8) +215568*a(n-9) -376712*a(n-10) -696976*a(n-11) +1312296*a(n-12) +1459424*a(n-13) -3006176*a(n-14) -1933056*a(n-15) +4580288*a(n-16) +1473920*a(n-17) -4578688*a(n-18) -415488*a(n-19) +2871808*a(n-20) -233472*a(n-21) -1019904*a(n-22) +217088*a(n-23) +155648*a(n-24) -49152*a(n-25)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A158550 A156994 A304619 * A232718 A204957 A263305

Adjacent sequences:  A204715 A204716 A204717 * A204719 A204720 A204721

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 2012

STATUS

approved

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Last modified May 22 23:18 EDT 2022. Contains 353959 sequences. (Running on oeis4.)