Number of n X 3 0..1 arrays with rows nondecreasing and antidiagonals unimodal.

A224128

Number of n X 3 0..1 arrays with rows nondecreasing and antidiagonals unimodal.

Terms

    a(0) =4a(1) =16a(2) =58a(3) =208a(4) =748a(5) =2692a(6) =9688a(7) =34864a(8) =125464a(9) =451504a(10) =1624816a(11) =5847184a(12) =21042112a(13) =75723712a(14) =272504992a(15) =980656768a(16) =3529064512a(17) =12699954496a(18) =45703002496a(19) =164470230016a(20) =591874824064

External references