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A222980 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
1, 4, 14, 70, 326, 1630, 8058, 40598, 204914, 1041934, 5315674, 27228710, 139873618, 720480478, 3719466954, 19240428310, 99703918274, 517480871374, 2689599901242, 13996937063430, 72925251133490, 380345069219262, 1985607474867114 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A222986

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A065606 A049372 A050549 * A321273 A322700 A167144

Adjacent sequences:  A222977 A222978 A222979 * A222981 A222982 A222983

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 11 2013

STATUS

approved

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Last modified February 23 07:08 EST 2020. Contains 332159 sequences. (Running on oeis4.)