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A252772 Number of (n+2)X(2+2) 0..3 arrays with every consecutive three elements in every row, column and nw-se diagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 1
1028, 4717, 23114, 121043, 649951, 3523216, 19170149, 104987624, 576681145, 3171047173, 17490297027, 96593843143, 533791409154, 2954525292098, 16363224352613, 90662353009326, 502747340040879, 2788709900040761 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A252777

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A247947 A066133 A119455 * A168189 A045031 A250759

Adjacent sequences:  A252769 A252770 A252771 * A252773 A252774 A252775

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 21 2014

STATUS

approved

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Last modified January 20 14:02 EST 2020. Contains 331094 sequences. (Running on oeis4.)