Number of n X 2 arrays containing 2 copies of 0..n-1 with row sums equal.
A268363
Number of n X 2 arrays containing 2 copies of 0..n-1 with row sums equal.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =96a(5) =480a(6) =5760a(7) =40320a(8) =645120a(9) =5806080a(10) =116121600a(11) =1277337600a(12) =30656102400a(13) =398529331200
External references
- oeis: A268363