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A202743 Number of 2Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns 1
2, 2, 6, 22, 54, 102, 214, 582, 1590, 3814, 8662, 20934, 53942, 137190, 335574, 815942, 2032694, 5139942, 12902614, 32059846, 79807158, 200325350, 504502230, 1267146054, 3176193590, 7975495910, 20082938838, 50611676614, 127466481334 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A202742

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..168

EXAMPLE

Some solutions for n=5

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

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

CROSSREFS

Sequence in context: A225942 A004077 A271217 * A007985 A097090 A085403

Adjacent sequences:  A202740 A202741 A202742 * A202744 A202745 A202746

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 23 2011

STATUS

approved

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Last modified June 28 05:40 EDT 2022. Contains 354903 sequences. (Running on oeis4.)