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A284223 Number of 2 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. 1
2, 6, 13, 44, 143, 495, 1746, 6399, 23776, 89321, 337909, 1285710, 4914573, 18861581, 72633154, 280492954, 1085801918, 4211904917, 16367963509, 63710308355, 248341387058, 969279971828, 3787525164193, 14815659532381, 58010290470976 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 2 of A284222.
LINKS
EXAMPLE
Some solutions for n=4
..0..0..1..1. .0..0..1..0. .0..0..0..0. .0..0..0..1. .0..0..0..1
..1..0..0..0. .1..1..0..0. .1..1..0..1. .1..1..0..0. .1..0..1..1
CROSSREFS
Cf. A284222.
Sequence in context: A231385 A001373 A320804 * A241784 A211995 A245010
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 23 2017
STATUS
approved

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Last modified April 22 10:51 EDT 2024. Contains 371897 sequences. (Running on oeis4.)