Number of (n+1)X2 0..3 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.
A203734
Number of (n+1)X2 0..3 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) =90a(1) =499a(2) =2166a(3) =8667a(4) =31942a(5) =111916a(6) =376415a(7) =1228141a(8) =3911718a(9) =12225055a(10) =37629475a(11) =114415963a(12) =344453875a(13) =1028640925a(14) =3051602949a(15) =9004181108a(16) =26450597561a(17) =77418965194a(18) =225924263865a(19) =657679624225
External references
- oeis: A203734