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A223105 Number of 2Xn 0..2 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
0, 6, 24, 225, 1456, 11874, 86726, 681306, 5213490, 40813074, 318018986, 2499530547, 19657584586, 155231158734, 1227855690342, 9736016121693, 77325805291432, 615206556468342, 4901472503744342, 39103441462583022 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A223104

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..29

EXAMPLE

Some solutions for n=3

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

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

CROSSREFS

Sequence in context: A277985 A091097 A231317 * A112675 A052583 A052671

Adjacent sequences:  A223102 A223103 A223104 * A223106 A223107 A223108

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2013

STATUS

approved

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Last modified June 15 12:29 EDT 2021. Contains 345048 sequences. (Running on oeis4.)