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

A224168

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

Terms

    a(0) =50a(1) =684a(2) =4739a(3) =22988a(4) =87878a(5) =282372a(6) =794220a(7) =2010035a(8) =4668304a(9) =10095924a(10) =20559019a(11) =39765666a(12) =73565736a(13) =130901340a(14) =225070360a(15) =375375241a(16) =609239622a(17) =964886492a(18) =1494683371a(19) =2269272536a(20) =3382617538a(21) =4958111188a(22) =7155904828a(23) =10181634047

External references