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A069378
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Number of n X 3 binary arrays with a path of adjacent 1's from top row to bottom row.
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0
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7, 37, 197, 1041, 5503, 29089, 153769, 812849, 4296863, 22713981, 120070149, 634712209, 3355201895, 17736195433, 93756691401, 495614587553, 2619907077991, 13849295944501, 73209847696773
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| G.f.: x*(7-12*x+x^2+2*x^3-2*x^4)/(1-7*x+9*x^2+x^3-4*x^4+2*x^5). - Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 02 2003
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CROSSREFS
| Cf. 1 X n A000225, 2 X n A005061, n X 2 A001333, 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: A106925 A085640 A196805 * A117130 A002807 A124610
Adjacent sequences: A069375 A069376 A069377 * A069379 A069380 A069381
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Mar 22 2002.
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