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A226990 Number of nX4 0..4 arrays of sums of 2X2 subblocks of some (n+1)X5 binary array with rows and columns of the latter in lexicographically nondecreasing order 1

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

%S 21,313,2820,24158,180712,1187869,6897735,35818171,168412446,

%T 725322952,2890248513,10747422169,37565694126,124186120157,

%U 390330632256,1171738349385,3372578086357,9339039810942,24954235842112,64510189847669

%N Number of nX4 0..4 arrays of sums of 2X2 subblocks of some (n+1)X5 binary array with rows and columns of the latter in lexicographically nondecreasing order

%C Column 4 of A226992

%H R. H. Hardin, <a href="/A226990/b226990.txt">Table of n, a(n) for n = 1..62</a>

%H R. H. Hardin, <a href="/A226990/a226990.txt">Empirical polynomial of degree 31</a>

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

%e Some solutions for n=4

%e ..0..0..2..4....0..0..1..3....0..0..1..3....1..2..2..3....0..1..2..2

%e ..0..0..2..4....0..1..2..3....1..2..3..3....2..1..1..2....0..2..4..3

%e ..0..1..2..2....1..3..2..2....2..4..4..2....3..2..2..2....1..2..3..3

%e ..0..2..2..1....2..3..3..2....3..4..4..3....4..4..3..2....2..3..3..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 25 2013

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Last modified April 25 05:56 EDT 2024. Contains 371964 sequences. (Running on oeis4.)