T(n,k)=Number of nXk 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.
A278627
T(n,k)=Number of nXk 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.
Terms
- a(0) =0a(1) =3a(2) =3a(3) =16a(4) =46a(5) =16a(6) =51a(7) =357a(8) =357a(9) =51a(10) =126a(11) =1952a(12) =4754a(13) =1952a(14) =126a(15) =266a(16) =8518a(17) =49503a(18) =49503a(19) =8518a(20) =266a(21) =504a(22) =31605a(23) =439446a(24) =1069536a(25) =439446a(26) =31605a(27) =504a(28) =882a(29) =103546
External references
- oeis: A278627