A260972 - OEIS

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A260972

Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101

48, 133, 372, 1513, 4592, 18706, 45504, 195280, 441072, 2093846, 4057280, 20962048, 38827984, 225849174, 367470344, 2376475916, 3621888816, 26598528246, 37810953848, 300880005340, 400697050360

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A260980

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Some solutions for n=4

..0..0..0..1..0..0....0..1..0..0..0..0....1..0..0..0..0..0....1..0..0..0..1..0

..0..0..1..0..0..1....0..0..0..0..0..0....0..1..0..0..0..1....0..0..0..0..0..0

..0..0..0..0..1..0....1..0..0..0..1..0....0..0..0..1..0..0....0..1..0..0..0..0