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A302891 Number of 4Xn 0..1 arrays with every element equal to 0, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1

%I #4 Apr 15 2018 10:51:47

%S 8,3,141,238,2278,12782,98458,714934,5542097,43212107,339688717,

%T 2688321962,21308399522,169280033672,1345687831167,10704512813411,

%U 85174284764693,677851440008972,5395169330701188,42943990203275896

%N Number of 4Xn 0..1 arrays with every element equal to 0, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

%C Row 4 of A302889.

%H R. H. Hardin, <a href="/A302891/b302891.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 13*a(n-1) -12*a(n-2) -356*a(n-3) +616*a(n-4) +5083*a(n-5) -8496*a(n-6) -45548*a(n-7) +56196*a(n-8) +312181*a(n-9) -273657*a(n-10) -1619340*a(n-11) +1141670*a(n-12) +6721822*a(n-13) -4280936*a(n-14) -23586213*a(n-15) +14143180*a(n-16) +70972322*a(n-17) -42559939*a(n-18) -179915012*a(n-19) +118698279*a(n-20) +379886532*a(n-21) -289705583*a(n-22) -669242363*a(n-23) +574942292*a(n-24) +1024958274*a(n-25) -945572342*a(n-26) -1418419501*a(n-27) +1353749786*a(n-28) +1760748357*a(n-29) -1743439270*a(n-30) -1875647765*a(n-31) +2042011697*a(n-32) +1638648467*a(n-33) -2153570928*a(n-34) -1137848157*a(n-35) +1988432432*a(n-36) +621772336*a(n-37) -1503116866*a(n-38) -287645124*a(n-39) +872723132*a(n-40) +133853876*a(n-41) -374946624*a(n-42) -75375840*a(n-43) +109068696*a(n-44) +36225824*a(n-45) -18718304*a(n-46) -12108800*a(n-47) +83968*a(n-48) +1946624*a(n-49) +634880*a(n-50) +65536*a(n-51) for n>54

%e Some solutions for n=5

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

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

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

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

%Y Cf. A302889.

%K nonn

%O 1,1

%A _R. H. Hardin_, Apr 15 2018

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Last modified July 16 15:42 EDT 2024. Contains 374353 sequences. (Running on oeis4.)