Number of (n+1)X4 0..1 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) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing.
A203447
Number of (n+1)X4 0..1 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) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing.
Terms
- a(0) =32a(1) =80a(2) =321a(3) =1177a(4) =4200a(5) =13777a(6) =42112a(7) =120522a(8) =325918a(9) =838830a(10) =2069033a(11) =4920266a(12) =11341301a(13) =25458409a(14) =55884995a(15) =120402167a(16) =255405453a(17) =534912676a(18) =1108733446a(19) =2279008959a(20) =4653553590a(21) =9452873217a(22) =19124629018a(23) =38573101568a(24) =77618789808
External references
- oeis: A203447