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A203818 Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements 0
144, 27216, 28005264, 157025515248, 4802315365587600, 801390350388172407408, 729769248139791415275682704, 3626511808446899710619902249927536 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A203826

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

..3..2..3..0..0....0..2..2..1..0....3..1..1..1..3....1..2..0..1..0

..3..0..3..2..1....3..1..0..1..0....3..0..2..0..3....0..2..3..1..2

..1..2..3..0..0....0..1..2..1..3....3..0..1..1..1....1..2..0..0..2

..1..0..3..1..3....3..1..2..0..2....3..2..3..0..2....0..3..3..3..2

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

CROSSREFS

Sequence in context: A091037 A304555 A231784 * A299953 A230788 A231938

Adjacent sequences:  A203815 A203816 A203817 * A203819 A203820 A203821

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2012

STATUS

approved

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Last modified January 22 15:57 EST 2019. Contains 319364 sequences. (Running on oeis4.)