Number of 4Xn 0..3 arrays with rows nondecreasing and antidiagonals unimodal.

A224026

Number of 4Xn 0..3 arrays with rows nondecreasing and antidiagonals unimodal.

Terms

    a(0) =256a(1) =10000a(2) =112436a(3) =772683a(4) =4002738a(5) =16861106a(6) =60614473a(7) =192152734a(8) =549805730a(9) =1444560196a(10) =3531148666a(11) =8113219067a(12) =17664791690a(13) =36688857572a(14) =73086084181a(15) =140275448000a(16) =260397984212a(17) =469049039484a(18) =822128311864

External references