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A284224 Number of 3Xn 0..1 arrays with the number of 1s horizontally or antidiagonally adjacent to some 0 equal to the number of 0s adjacent to some 1, with top left element zero. 1
4, 19, 70, 499, 3214, 22729, 163708, 1209005, 9018250, 67956917, 515031078, 3926103884, 30049105764, 230871573750, 1779036977175, 13746097605518, 106448904000193, 826010061981163, 6420762665883318, 49989175241774203 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A284222.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A284222.

Sequence in context: A167247 A267192 A219972 * A268214 A027208 A085348

Adjacent sequences:  A284221 A284222 A284223 * A284225 A284226 A284227

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 23 2017

STATUS

approved

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Last modified November 19 11:09 EST 2019. Contains 329319 sequences. (Running on oeis4.)