Number of (n+1)X3 0..2 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively.
A203722
Number of (n+1)X3 0..2 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively.
Terms
- a(0) =113a(1) =480a(2) =1632a(3) =4737a(4) =12470a(5) =30335a(6) =69612a(7) =152260a(8) =320546a(9) =653622a(10) =1298042a(11) =2520746a(12) =4803363a(13) =9005619a(14) =16650695a(15) =30417076a(16) =54987344a(17) =98502681a(18) =175052609a(19) =308918598a(20) =541794370a(21) =945035051a(22) =1640400129a(23) =2835103075a(24) =4880936409
External references
- oeis: A203722