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A204716 Number of (n+1) X 2 0..1 arrays with the permanents of 2 X 2 subblocks nondecreasing rightwards and downwards. 2
16, 51, 156, 450, 1267, 3490, 9490, 25545, 68286, 181584, 481021, 1270576, 3348916, 8812575, 23161632, 60817950, 159583495, 418515070, 1097126806, 2875195509, 7533120066, 19733485356, 51685977361, 135361729420, 354473776312 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A204723.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) - a(n-2) - 9*a(n-3) + 4*a(n-4) + 5*a(n-5) - 2*a(n-6).

Empirical g.f.: x*(16 - 13*x - 32*x^2 + 21*x^3 + 18*x^4 - 8*x^5) / ((1 - x)*(1 + x)^2*(1 - 2*x)*(1 - 3*x + x^2)). - Colin Barker, Mar 03 2018

EXAMPLE

Some solutions for n=4:

  1 1   1 1   0 0   1 0   1 0   0 1   1 0   1 1   1 0   1 1

  0 1   1 1   0 1   1 0   0 0   0 0   0 1   0 0   1 1   1 1

  1 1   1 1   1 0   0 1   0 1   0 0   1 1   0 1   0 1   1 1

  0 1   1 1   0 1   1 1   1 0   1 0   1 1   0 0   1 1   1 1

  1 1   1 1   1 0   1 0   1 1   1 1   1 1   0 1   0 1   1 1

CROSSREFS

Cf. A204723.

Sequence in context: A204723 A204962 A080860 * A192248 A297640 A236523

Adjacent sequences:  A204713 A204714 A204715 * A204717 A204718 A204719

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 18 2012

STATUS

approved

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Last modified June 25 03:00 EDT 2022. Contains 354835 sequences. (Running on oeis4.)