A207688 - OEIS

A207688

Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 1 vertically.

2, 16, 60, 256, 1872, 15376, 145200, 1887876, 32939236, 653211364, 16761239040, 557862597604, 24505820603880, 1374667445474064, 89177394083197716, 7769360160391840000, 912190244879661701508, 129010731422391263108196

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OFFSET

1,1

COMMENTS

Diagonal of A207693.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A207693.

Sequence in context: A357816 A170991 A209219 * A208495 A207583 A152665

Adjacent sequences: A207685 A207686 A207687 * A207689 A207690 A207691

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 19 2012

STATUS

approved