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A259420 Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 or 0111 1
13, 243, 12953, 1990133, 873754597, 1101527291223, 3975872829274865, 41147590225188806309, 1220087829652769318601383, 103689338398592714772850061461, 25251868912730969096083539641411367 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A259427

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..14

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Cf. A259427

Sequence in context: A157969 A218229 A020520 * A203156 A049665 A196665

Adjacent sequences:  A259417 A259418 A259419 * A259421 A259422 A259423

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 26 2015

STATUS

approved

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Last modified January 27 22:46 EST 2022. Contains 350654 sequences. (Running on oeis4.)