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A227101 Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of two, with rows and columns of the latter in lexicographically nondecreasing order 1

%I #5 Aug 11 2014 22:45:52

%S 11,136,1084,8427,60039,384591,2209056,11456481,54141062,235262503,

%T 947783225,3566095007,12613787982,42187331840,134097083832,

%U 406916965311,1183456563350,3310261263895,8932219958483,23313790229352,59000955033387

%N Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of two, with rows and columns of the latter in lexicographically nondecreasing order

%C Column 4 of A227103

%H R. H. Hardin, <a href="/A227101/b227101.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A227101/a227101.txt">Empirical polynomial of degree 31</a>

%F Empirical polynomial of degree 31 (see link above)

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 01 2013

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Last modified April 17 23:15 EDT 2024. Contains 371767 sequences. (Running on oeis4.)