A284223 - OEIS

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.

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

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

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