Number of (3*n) X n binary arrays with rows in nonincreasing order, 3 ones in every column and no more than 3 ones in any row.
A188404
Number of (3*n) X n 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) =23a(3) =214a(4) =2698a(5) =44288a(6) =902962a(7) =22262244a(8) =648446612a(9) =21940389584a(10) =849992734124
External references
- oeis: A188404