Number of n X 2 0..3 arrays with rows, antidiagonals and columns unimodal.

A223756

Number of n X 2 0..3 arrays with rows, antidiagonals and columns unimodal.

Terms

    a(0) =16a(1) =256a(2) =2500a(3) =16900a(4) =87616a(5) =372100a(6) =1352569a(7) =4338889a(8) =12559936a(9) =33362176a(10) =82373776a(11) =190992400a(12) =419266576a(13) =877225924a(14) =1759047481a(15) =3396208729a(16) =6338070544a(17) =11471266816a(18) =20192978404a(19) =34657779556a(20) =58123423744a(21) =95427859396

External references