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A222502 Number of 3Xn 0..3 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order 0
0, 4, 6, 35, 81, 1758, 3964, 114039, 249121, 7654526, 17528506, 521272961, 1262530701, 35686911158, 90924250112, 2450312511955, 6543156266427, 168629675723808, 470547135992104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A222500

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Sequence in context: A137021 A176002 A175061 * A092187 A092765 A056315

Adjacent sequences:  A222499 A222500 A222501 * A222503 A222504 A222505

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 23 2013

STATUS

approved

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Last modified December 7 22:50 EST 2021. Contains 349590 sequences. (Running on oeis4.)