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A164491
Number of binary strings of length n with no substrings equal to 0010 0100 or 1001.
1
13, 23, 40, 70, 122, 213, 371, 647, 1128, 1967, 3430, 5981, 10429, 18185, 31709, 55291, 96411, 168112, 293137, 511143, 891280, 1554125, 2709928, 4725302, 8239510, 14367235, 25052150, 43683438, 76170818, 132819068, 231596631, 403835084
OFFSET
4,1
FORMULA
G.f.: -x^4*(13+10*x+4*x^2+7*x^3+12*x^4+8*x^5) / ( -1+x+x^2+x^5+x^6 ). - R. J. Mathar, Jan 19 2011
CROSSREFS
Sequence in context: A046119 A374102 A164416 * A164434 A164494 A164407
KEYWORD
nonn,easy
AUTHOR
R. H. Hardin, Aug 14 2009
STATUS
approved