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A213468 Number of 0..3 arrays of length 2*n+3 with sum less than 3*n in any length 2n subsequence (=less than 50% duty cycle) 1

%I

%S 70,2735,58898,1091036,19105020,325333429,5451265872,90406374528,

%T 1488870622780,24396922947484,398282413965566,6483402596528564,

%U 105301980143117156,1707201970861977822,27637076220888829232

%N Number of 0..3 arrays of length 2*n+3 with sum less than 3*n in any length 2n subsequence (=less than 50% duty cycle)

%C Row 4 of A213464

%H R. H. Hardin, <a href="/A213468/b213468.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

%e ..0....2....2....1....0....2....0....0....3....1....1....0....0....0....1....3

%e ..2....3....2....0....0....0....2....2....1....2....3....0....2....2....3....1

%e ..1....1....0....3....2....1....1....1....1....3....0....0....0....2....3....0

%e ..0....2....0....0....0....2....2....2....0....0....1....2....0....0....0....0

%e ..0....0....0....0....0....1....0....0....0....0....1....1....0....0....1....2

%e ..2....0....3....3....0....0....0....2....3....1....2....0....3....2....0....0

%e ..3....0....0....0....1....0....1....1....0....0....1....0....2....1....1....1

%e ..1....3....0....1....2....2....3....2....3....0....0....1....0....3....0....0

%e ..1....0....2....1....3....2....2....1....2....3....0....1....2....2....3....3

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 12 2012

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Last modified June 28 21:04 EDT 2022. Contains 354907 sequences. (Running on oeis4.)