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 A220316 Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..2 nX2 array 1

%I #5 Dec 10 2012 16:31:13

%S 1,5,24,89,389,1566,6401,25704,103047,411453,1640962,6538036,26037222,

%T 103664093,412658625,1642555969,6537717638,26020883563,103564418265,

%U 412188609650,1640510914951,6529219819790,25986198727161,103424615577923

%N Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..2 nX2 array

%C Column 2 of A220319

%H R. H. Hardin, <a href="/A220316/b220316.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 4*a(n-1) +6*a(n-2) -22*a(n-3) -15*a(n-4) +10*a(n-5) +56*a(n-6) +46*a(n-7) -112*a(n-8) -84*a(n-9) -67*a(n-10) +358*a(n-11) +277*a(n-12) -168*a(n-13) -638*a(n-14) -162*a(n-15) +664*a(n-16) +408*a(n-17) +180*a(n-18) -8*a(n-19) +76*a(n-20) -264*a(n-21) +96*a(n-22)

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 10 2012

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Last modified June 22 04:48 EDT 2024. Contains 373565 sequences. (Running on oeis4.)