Number of nX3 0..2 arrays with rows and columns unimodal and antidiagonals nondecreasing.

A224052

Number of nX3 0..2 arrays with rows and columns unimodal and antidiagonals nondecreasing.

Terms

    a(0) =22a(1) =218a(2) =1232a(3) =5219a(4) =18502a(5) =57911a(6) =164781a(7) =433762a(8) =1068664a(9) =2485274a(10) =5492414a(11) =11598655a(12) =23514508a(13) =45950300a(14) =86850332a(15) =159256653a(16) =284063565a(17) =494009870a(18) =839363352a(19) =1395884951a(20) =2275822878a(21) =3642884361a(22) =5732370123a(23) =8877939920

External references