A232888 - OEIS

A232888

Number of (2+1)X(n+1) 0..3 arrays x(i,j) with row sums sum{x(i,j), j=1..n+1} nondecreasing, and column sums sum{i*x(i,j), i=1..2+1} nondecreasing

%I #4 Dec 02 2013 04:12:20

%S 578,12920,235936,3695555,51264185,644182816,7460893864,80676054597,

%T 822720588842,7976326518730,73999362424318,660467507825188,

%U 5696611476327209,47660470235252790,388033944154755006

%N Number of (2+1)X(n+1) 0..3 arrays x(i,j) with row sums sum{x(i,j), j=1..n+1} nondecreasing, and column sums sum{i*x(i,j), i=1..2+1} nondecreasing

%C Row 2 of A232886

%H R. H. Hardin, <a href="/A232888/b232888.txt">Table of n, a(n) for n = 1..19</a>

%e Some solutions for n=2

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 02 2013