Number of 3Xn 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.

A223920

Number of 3Xn 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.

Terms

    a(0) =10a(1) =100a(2) =666a(3) =3311a(4) =13347a(5) =45988a(6) =140236a(7) =387671a(8) =988447a(9) =2354539a(10) =5291652a(11) =11307388a(12) =23115717a(13) =45438234a(14) =86243127a(15) =158615577a(16) =283521156a(17) =493809754a(18) =839915122a(19) =1397838161a(20) =2280164963a(21) =3651068140a(22) =5746477482a(23) =8900889311

External references