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A236738 Number of (n+1)X(n+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal 0
81, 1411, 68839, 17740369, 14977205669, 41970035313995, 367339284802529639, 10214681449663016578969, 894198234345435455356272041 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A236746

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A116205 A237455 A253488 * A236801 A282646 A283542

Adjacent sequences:  A236735 A236736 A236737 * A236739 A236740 A236741

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 30 2014

STATUS

approved

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Last modified August 22 05:00 EDT 2019. Contains 326172 sequences. (Running on oeis4.)