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A164473
Number of binary strings of length n with no substrings equal to 0001 0101 or 1011.
1
13, 21, 34, 53, 82, 128, 198, 305, 471, 726, 1117, 1720, 2648, 4074, 6269, 9647, 14842, 22835, 35134, 54054, 83162, 127947, 196847, 302848, 465933, 716838, 1102852, 1696736, 2610425, 4016129, 6178802, 9506069, 14625054, 22500596, 34617094
OFFSET
4,1
FORMULA
G.f.: -x^4*(-13+5*x-5*x^2+7*x^3-2*x^4-4*x^5+8*x^6) / ( (x-1)*(x^6+x^3+x-1) ). - R. J. Mathar, Jan 19 2011
CROSSREFS
Sequence in context: A057200 A164454 A164426 * A164481 A164433 A164479
KEYWORD
nonn,easy
AUTHOR
R. H. Hardin, Aug 14 2009
STATUS
approved