T(n,k)=Number of nXk binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order.

A183413

T(n,k)=Number of nXk binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =2a(4) =5a(5) =2a(6) =3a(7) =8a(8) =8a(9) =3a(10) =3a(11) =15a(12) =22a(13) =15a(14) =3a(15) =4a(16) =21a(17) =75a(18) =75a(19) =21a(20) =4a(21) =4a(22) =34a(23) =152a(24) =380a(25) =152a(26) =34a(27) =4a(28) =5a(29) =44

External references