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A251886 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 3 6 or 7 and every diagonal and antidiagonal sum 2 3 6 or 7 0
1280, 1232, 556, 1316, 3530, 9836, 33218, 252162, 1017410, 4251650, 95453186, 461119490, 2176843778, 165104582658, 884163477506, 4458176053250, 1236435185172482, 6998537539682306, 36521378228207618 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A251894

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A293923 A251890 A251889 * A234137 A160233 A251887

Adjacent sequences:  A251883 A251884 A251885 * A251887 A251888 A251889

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 10 2014

STATUS

approved

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Last modified October 18 01:39 EDT 2021. Contains 348065 sequences. (Running on oeis4.)