Number of nX3 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order.

A183410

Number of nX3 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) =2a(1) =8a(2) =22a(3) =75a(4) =152a(5) =410a(6) =719a(7) =1632a(8) =2564a(9) =5130a(10) =7525a(11) =13720a(12) =19058a(13) =32359a(14) =43246a(15) =69423a(16) =89870a(17) =137872a(18) =174193a(19) =257432a(20) =318491a(21) =456159a(22) =554945a(23) =773911a(24) =927617a(25) =1264264a(26) =1496874a(27) =1999757a(28) =2341547a(29) =3073792

External references