Number of nX3 0..3 arrays with rows and columns unimodal and antidiagonals nondecreasing.

A224045

Number of nX3 0..3 arrays with rows and columns unimodal and antidiagonals nondecreasing.

Terms

    a(0) =50a(1) =984a(2) =9731a(3) =67585a(4) =376734a(5) =1801402a(6) =7655477a(7) =29502561a(8) =104437965a(9) =342818189a(10) =1051490221a(11) =3033475639a(12) =8279003183a(13) =21484969347a(14) =53256520053a(15) =126598758740a(16) =289630093258a(17) =639706047860

External references