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A223665 Number of nX4 0..1 arrays with rows, diagonals and antidiagonals unimodal 1

%I

%S 11,121,948,6454,44693,321163,2343189,17087771,124218846,901767902,

%T 6546694983,47541956223,345294309121,2507850941319,18213891195978,

%U 132281285512572,960713718887517,6977351377339193,50674293382202763

%N Number of nX4 0..1 arrays with rows, diagonals and antidiagonals unimodal

%C Column 4 of A223669

%H R. H. Hardin, <a href="/A223665/b223665.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 9*a(n-1) -8*a(n-2) -63*a(n-3) +250*a(n-4) -152*a(n-5) -522*a(n-6) -2735*a(n-7) +4120*a(n-8) +9651*a(n-9) +1347*a(n-10) -13682*a(n-11) -24899*a(n-12) +6443*a(n-13) +11258*a(n-14) +8578*a(n-15) -11567*a(n-16) +8480*a(n-17) +22660*a(n-18) -17587*a(n-19) +2236*a(n-20) +4536*a(n-21) -2700*a(n-22) -864*a(n-23)

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 25 2013

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Last modified June 27 16:27 EDT 2022. Contains 354896 sequences. (Running on oeis4.)