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A267784 Number of nX4 0..1 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value. 1

%I

%S 15,225,1056,5081,14956,44742,102954,238813,472174,935890,1669256,

%T 2973801,4921484,8116406,12686802,19733869,29485150,43804354,63094592,

%U 90326137,126206748,175240166,238647082,322974141,430276638,569730226

%N Number of nX4 0..1 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

%C Column 4 of A267788.

%H R. H. Hardin, <a href="/A267784/b267784.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 2*a(n-1) +6*a(n-2) -14*a(n-3) -14*a(n-4) +42*a(n-5) +14*a(n-6) -70*a(n-7) +70*a(n-9) -14*a(n-10) -42*a(n-11) +14*a(n-12) +14*a(n-13) -6*a(n-14) -2*a(n-15) +a(n-16) for n>18

%e Some solutions for n=4

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

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

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

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

%Y Cf. A267788.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 20 2016

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Last modified October 16 05:41 EDT 2021. Contains 348035 sequences. (Running on oeis4.)