Number of (n+1)X(3+1) 0..1 arrays with nondecreasing sum of every two consecutive values in every row and column.

A250427

Number of (n+1)X(3+1) 0..1 arrays with nondecreasing sum of every two consecutive values in every row and column.

Terms

    a(0) =81a(1) =324a(2) =1296a(3) =3600a(4) =10000a(5) =22500a(6) =50625a(7) =99225a(8) =194481a(9) =345744a(10) =614656a(11) =1016064a(12) =1679616a(13) =2624400a(14) =4100625a(15) =6125625a(16) =9150625a(17) =13176900a(18) =18974736a(19) =26501904a(20) =37015056a(21) =50381604a(22) =68574961a(23) =91298025a(24) =121550625a(25) =158760000a(26) =207360000

External references