Number of n X 3 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

A223928

Number of n X 3 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

Terms

    a(0) =22a(1) =218a(2) =1116a(3) =4498a(4) =15791a(5) =49646a(6) =142177a(7) =375777a(8) =926559a(9) =2150622a(10) =4734429a(11) =9947574a(12) =20054339a(13) =38965176a(14) =73242344a(15) =133617438a(16) =237234842a(17) =410906947a(18) =695757399a(19) =1153741182a(20) =1876668923a(21) =2998531806a(22) =4712127751a(23) =7291234403

External references