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

A233362

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

Terms

    a(0) =23a(1) =113a(2) =568a(3) =2639a(4) =10477a(5) =38240a(6) =132356a(7) =441895a(8) =1419797a(9) =4391603a(10) =13112413a(11) =37979354a(12) =106993204a(13) =293812166a(14) =789782037a(15) =2085497193a(16) =5420670439a(17) =13888977532a(18) =35116145716a(19) =87723703925

External references