Number of n X 2 arrays containing 2 copies of 0..n-1 with row sums equal and column sums equal.
A265086
Number of n X 2 arrays containing 2 copies of 0..n-1 with row sums equal and column sums equal.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =6300a(7) =45360a(8) =589680a(9) =5443200a(10) =94802400a(11) =1032847200a(12) =22962139200a(13) =291502411200
External references
- oeis: A265086