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

A224312

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

Terms

    a(0) =81a(1) =1944a(2) =11361a(3) =45453a(4) =164514a(5) =562760a(6) =1825800a(7) =5585818a(8) =16074063a(9) =43567313a(10) =111632420a(11) =271667665a(12) =630966702a(13) =1405080075a(14) =3012670262a(15) =6242914246a(16) =12544093805a(17) =24510622826a(18) =46689053477a(19) =86888070112a(20) =158272032306

External references