Number of 3 X n (0,1) matrices such that each row and each column is nondecreasing or nonincreasing.

A086113

Number of 3 X n (0,1) matrices such that each row and each column is nondecreasing or nonincreasing.

Terms

    a(0) =6a(1) =36a(2) =102a(3) =216a(4) =390a(5) =636a(6) =966a(7) =1392a(8) =1926a(9) =2580a(10) =3366a(11) =4296a(12) =5382a(13) =6636a(14) =8070a(15) =9696a(16) =11526a(17) =13572a(18) =15846a(19) =18360a(20) =21126a(21) =24156a(22) =27462a(23) =31056a(24) =34950a(25) =39156a(26) =43686a(27) =48552a(28) =53766a(29) =59340

External references