Number of (3*n)Xn binary arrays with rows in nonincreasing order, 3 ones in every column and no more than 3 ones in any row.
A188418
Number of (3*n)Xn binary arrays with rows in nonincreasing order, 3 ones in every column and no more than 3 ones in any row.
Terms
- a(0) =1a(1) =4a(2) =39a(3) =723a(4) =21965a(5) =968230a(6) =57967660a(7) =4505774905a(8) =439923593145
External references
- oeis: A188418