Number of (4*n) X n binary arrays with rows in nonincreasing order, 4 ones in every column and no more than 2 ones in any row.
A188405
Number of (4*n) X n binary arrays with rows in nonincreasing order, 4 ones in every column and no more than 2 ones in any row.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =42a(4) =641a(5) =14751a(6) =478711a(7) =20758650a(8) =1158207312a(9) =80758709676
External references
- oeis: A188405