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A185521 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock singular.

%I A185521 #7 Jul 22 2025 09:52:14
%S A185521 31,143,143,593,1489,593,2553,12361,12361,2553,10847,115979,154561,
%T A185521 115979,10847,46303,1058503,2490449,2490449,1058503,46303,197329,
%U A185521 9856209,35659489,80761059,35659489,9856209,197329,841449,91539073,541370505
%N A185521 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock singular.
%C A185521 Table starts
%C A185521 .......31.........143............593..............2553................10847
%C A185521 ......143........1489..........12361............115979..............1058503
%C A185521 ......593.......12361.........154561...........2490449.............35659489
%C A185521 .....2553......115979........2490449..........80761059...........2183297449
%C A185521 ....10847.....1058503.......35659489........2183297449..........96865190255
%C A185521 ....46303.....9856209......541370505.......65652458491........5157904182519
%C A185521 ...197329....91539073.....7998109489.....1894624012417......249246507105681
%C A185521 ...841449...853020411...119752453041....56140705014995....12721664424927033
%C A185521 ..3587359..7948563615..1781802607473..1649002255383641...630667351622299519
%C A185521 .15295151.74110312433.26592505725449.48754926946880491.31779395697846344999
%H A185521 R. H. Hardin, <a href="/A185521/b185521.txt">Table of n, a(n) for n = 1..199</a>
%e A185521 Some solutions for 4X3
%e A185521 ..2..1..0....0..2..1....2..0..1....0..0..0....2..0..2....1..0..1....2..0..2
%e A185521 ..0..0..0....0..0..0....1..0..0....0..0..0....0..0..2....0..0..1....2..0..0
%e A185521 ..2..0..1....0..0..0....1..0..0....1..0..2....0..0..1....1..0..2....0..0..1
%e A185521 ..1..0..0....0..0..1....1..0..0....0..0..2....1..0..0....1..0..0....0..0..0
%K A185521 nonn,tabl
%O A185521 1,1
%A A185521 _R. H. Hardin_ Jan 29 2011