Number of 4Xn 0..2 arrays with rows unimodal and columns nondecreasing.

A224191

Number of 4Xn 0..2 arrays with rows unimodal and columns nondecreasing.

Terms

    a(0) =15a(1) =225a(2) =2205a(3) =15779a(4) =89380a(5) =422488a(6) =1727738a(7) =6272940a(8) =20614382a(9) =62231446a(10) =174603882a(11) =459586532a(12) =1143581612a(13) =2707062766a(14) =6128575771a(15) =13328965295a(16) =27955737041a(17) =56730240471a(18) =111704250407a(19) =213954477597a(20) =399506181220

External references