Number of n X 2 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.
A278728
Number of n X 2 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.
Terms
- a(0) =6a(1) =152a(2) =1947a(3) =17352a(4) =121520a(5) =712406a(6) =3633649a(7) =16547278a(8) =68531079a(9) =261693631a(10) =931194981a(11) =3113638802a(12) =9849622993a(13) =29642927267a(14) =85271613063a(15) =235393492799a(16) =625708778733
External references
- oeis: A278728