Number of 3 X n 0..3 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.

A224174

Number of 3 X n 0..3 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.

Terms

    a(0) =20a(1) =400a(2) =4739a(3) =38561a(4) =242114a(5) =1253770a(6) =5588411a(7) =22075529a(8) =78911656a(9) =259222964a(10) =791787532a(11) =2269535600a(12) =6149706181a(13) =15847969147a(14) =39036356744a(15) =92295124070a(16) =210220319550a(17) =462719488690a(18) =986952548003

External references