T(n,k)=Number of nXk 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

A278778

T(n,k)=Number of nXk 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =0a(6) =1a(7) =20a(8) =20a(9) =1a(10) =6a(11) =117a(12) =266a(13) =117a(14) =6a(15) =21a(16) =503a(17) =1972a(18) =1972a(19) =503a(20) =21a(21) =56a(22) =1750a(23) =10784a(24) =19750a(25) =10784a(26) =1750a(27) =56a(28) =126a(29) =5209

External references