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A069404
Half the number of n X 4 binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row.
3
7, 55, 377, 2427, 15253, 94847, 587031, 3625675, 22372413, 137993145, 850987067, 5247512077, 32357022035, 199515609775, 1230218484787, 7585536760417, 46772417567873, 288398549126971, 1778263916566525, 10964764644841043, 67608669872179151, 416874624972396255
OFFSET
1,1
LINKS
Sean A. Irvine, Java program (github)
CROSSREFS
Cf. 1 X n A000225, 2 X n A016269, vertical path of 1 A069361-A069395, vertical paths of 0+1 A069396-A069416, vertical path of 1 not 0 A069417-A069428, no vertical paths A069429-A069447, no horizontal or vertical paths A069448-A069452.
Sequence in context: A121183 A291891 A217327 * A198689 A320091 A172743
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 22 2002
EXTENSIONS
More terms from Sean A. Irvine, Aug 18 2024
STATUS
approved