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A193782 Number of n X n symmetric 0..3 arrays with no element equal to the sum or difference mod 4 of any two of its horizontal and vertical neighbors 1
4, 17, 77, 1099, 33151, 2100065, 268468949, 68719995395, 35184382602599, 36028797316842905, 73786976306927999773, 302231454904310883795947, 2475880078570809183639151007, 40564819207303345898201553712849 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..31

EXAMPLE

Some solutions for 4X4

..3..3..3..3....3..3..1..3....3..3..1..1....1..3..3..1....1..1..3..1

..3..1..1..3....3..3..1..1....3..3..3..3....3..3..1..1....1..1..3..3

..3..1..1..3....1..1..1..3....1..3..1..1....3..1..3..1....3..3..3..3

..3..3..3..1....3..1..3..3....1..3..1..1....1..1..1..3....1..3..3..3

CROSSREFS

Sequence in context: A123952 A005494 A257072 * A053486 A151249 A289924

Adjacent sequences:  A193779 A193780 A193781 * A193783 A193784 A193785

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2011

STATUS

approved

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Last modified August 24 14:36 EDT 2019. Contains 326285 sequences. (Running on oeis4.)