A163012 Number of nX3 binary arrays with all 1s connected and a path of 1s from top row to lower right corner

3, 16, 82, 416, 2103, 10633, 53767, 271882, 1374808, 6951884, 35153031, 177755487, 898841773, 4545100350, 22982840520, 116215466582, 587657328849, 2971559176087, 15026042394605, 75980970481664, 384206813990810

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