Number of nX1 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes.

A278604

Number of nX1 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =56a(5) =728a(6) =5328a(7) =27876a(8) =116304a(9) =411334a(10) =1281280a(11) =3606980a(12) =9346624a(13) =22597760a(14) =51507280a(15) =111578412a(16) =231211152a(17) =460720740a(18) =886647920a(19) =1653955415a(20) =2999760280a(21) =5303659240a(22) =9161558720a(23) =15492338160a(24) =25689792960a(25) =41836287690

External references