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A069307
Number of 3 X n binary arrays with a path of adjacent 1's from upper left corner to anywhere in right hand column.
14
21, 110, 581, 3070, 16227, 85776, 453423, 2396868, 12670261, 66977242, 354053617, 1871590506, 9893561055, 52299127660, 276462513603, 1461430140016, 7725380293233, 40837737667414, 215875562691877
OFFSET
2,1
FORMULA
G.f.: x^2*(21-37*x+14*x^3-8*x^4)/(1+2*x^5-7*x+9*x^2+x^3-4*x^4). - Vladeta Jovovic, Jul 02 2003
CROSSREFS
Cf. 2 X n A069306, 4 X n A069308, 5 X n A069309, 6 X n A069310, 7 X n A069311, 8 X n A069312, 9 X n A069313, 10 X n A069314, 11 X n A069315, 12 X n A069316, 13 X n A069317, 14 X n A069318, 15 X n A069319, 16 X n A069320, by columns A069294-A069305.
Sequence in context: A222347 A039611 A353622 * A157886 A039456 A182827
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 14 2002
STATUS
approved