Number of nX4 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

A224034

Number of nX4 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

Terms

    a(0) =5a(1) =19a(2) =58a(3) =168a(4) =488a(5) =1422a(6) =4160a(7) =12214a(8) =35960a(9) =106072a(10) =313246a(11) =925694a(12) =2736638a(13) =8092056a(14) =23930330a(15) =70772252a(16) =209309684a(17) =619043562a(18) =1830861726a(19) =5414905178a(20) =16014983408a(21) =47365507554a(22) =140087012360a(23) =414317718488

External references