Number of 4 X n 0..2 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.

A224264

Number of 4 X n 0..2 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.

Terms

    a(0) =15a(1) =225a(2) =2017a(3) =12467a(4) =59855a(5) =240829a(6) =850875a(7) =2717731a(8) =8000608a(9) =22004896a(10) =57114321a(11) =140968221a(12) =332855049a(13) =755508149a(14) =1654943378a(15) =3509994992a(16) =7227765020a(17) =14484196632a(18) =28304567857a(19) =54032736159a(20) =100918573991a(21) =184671328897a(22) =331497593861a(23) =584386115169

External references