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A163012 Number of nX3 binary arrays with all 1s connected and a path of 1s from top row to lower right corner 1
3, 16, 82, 416, 2103, 10633, 53767, 271882, 1374808, 6951884, 35153031, 177755487, 898841773, 4545100350, 22982840520, 116215466582, 587657328849, 2971559176087, 15026042394605, 75980970481664, 384206813990810 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n=1..100

FORMULA

Empirical: a(n)= 7*a(n-1) -11*a(n-2) +6*a(n-3) +a(n-4) -7*a(n-5) +a(n-6). [From R. J. Mathar, Aug 11 2009]

CROSSREFS

Sequence in context: A072615 A020871 A037780 * A164100 A041707 A037584

Adjacent sequences:  A163009 A163010 A163011 * A163013 A163014 A163015

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 20 2009

STATUS

approved

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Last modified July 29 17:41 EDT 2021. Contains 346346 sequences. (Running on oeis4.)