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A183767 1/32 the number of (n+1) X 5 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1. 1
12, 280, 7392, 205920, 5912192, 173065984, 5134924800, 153876579840, 4646469273600, 141154845511680, 4309194677698560, 132086184685977600, 4062564621910867968, 125316146802859048960, 3875293808717379141632 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirically a(n) = 2^(3*n)*Gamma(2*n+1/2)/(Gamma(n+1/2)*n!). - Peter Luschny, Sep 24 2018
EXAMPLE
Some solutions for 3 X 5:
..0..0..1..1..0....0..0..0..1..1....1..0..1..1..1....0..0..0..1..1
..0..0..0..0..0....1..1..1..1..1....1..1..0..0..1....0..1..1..1..0
..0..0..0..1..0....0..1..0..0..1....1..1..1..1..1....0..0..0..0..1
CROSSREFS
Column 4 of A183772.
Sequence in context: A295037 A295528 A166337 * A009604 A154669 A079519
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved

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Last modified July 18 17:21 EDT 2024. Contains 374388 sequences. (Running on oeis4.)