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A202744 Number of 3Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns 1
2, 8, 38, 140, 638, 3032, 14258, 70136, 350594, 1767452, 9029918, 46519544, 241210598, 1258499756, 6598909298, 34748813672, 183679125026, 974136322892, 5181534476414, 27634187724392, 147730324961126, 791463055043228 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A202742

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Sequence in context: A020130 A159051 A053520 * A112738 A220806 A192529

Adjacent sequences:  A202741 A202742 A202743 * A202745 A202746 A202747

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 23 2011

STATUS

approved

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Last modified July 5 15:05 EDT 2022. Contains 355099 sequences. (Running on oeis4.)