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A235422 Number of (2+1)X(n+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise 1

%I

%S 432,5022,60879,543946,4895505,35230388,255103234,1554228232,

%T 9515328218,50741400195,271565143251,1297890540438,6219668001557,

%U 27116924880173,118466428248793,477662770905341,1929017445264100,7271629530089986

%N Number of (2+1)X(n+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise

%C Row 2 of A235421

%H R. H. Hardin, <a href="/A235422/b235422.txt">Table of n, a(n) for n = 1..33</a>

%e Some solutions for n=3

%e ..0..1..0..2....2..1..1..0....1..1..0..0....0..1..1..0....0..0..1..0

%e ..2..2..2..0....2..2..2..1....1..1..1..0....2..0..1..1....2..2..1..1

%e ..1..2..1..2....1..2..2..1....2..2..1..1....1..2..1..1....2..1..2..2

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 10 2014

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Last modified August 19 06:48 EDT 2022. Contains 356216 sequences. (Running on oeis4.)