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 A256764 Number of (n+2)X(1+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum 1

%I #4 Apr 09 2015 21:29:32

%S 352,1936,9152,43264,189696,831744,3502080,14745600,60702720,

%T 249892864,1015758848,4128833536,16663379968,67251011584,270331805696,

%U 1086664474624,4358399852544,17480694104064,70025528475648

%N Number of (n+2)X(1+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum

%C Column 1 of A256771

%H R. H. Hardin, <a href="/A256764/b256764.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 8*a(n-1) -144*a(n-3) +272*a(n-4) +704*a(n-5) -2304*a(n-6) +5120*a(n-8) -4096*a(n-9)

%e Some solutions for n=4

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

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

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

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

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

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

%Y Cf. A256771

%K nonn

%O 1,1

%A _R. H. Hardin_, Apr 09 2015

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Last modified July 18 01:34 EDT 2024. Contains 374377 sequences. (Running on oeis4.)