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A069424
Number of n X 4 binary arrays with a path of adjacent 1's and no path of adjacent 0's from top row to bottom row.
0
1, 65, 1231, 17339, 217253, 2575297, 29682643, 337104939, 3798244149, 42611591165, 476921965419, 5330934738199, 59545502975241, 664849480893793, 7421696282496891, 82838232515999423, 924548372982432205, 10318403957821437753, 115156011527942405255
OFFSET
1,2
FORMULA
a(n) = A069379(n) - 2 * A069404(n). - Sean A. Irvine, Aug 23 2024
CROSSREFS
Cf. 2 X n A001047, n X 2 A034182, 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: A086021 A168029 A219413 * A264268 A086029 A221038
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 22 2002
EXTENSIONS
More terms from Sean A. Irvine, Aug 23 2024
STATUS
approved