T(n,k)=Number of nXk 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

A278634

T(n,k)=Number of nXk 0..2 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) =1a(4) =13a(5) =1a(6) =15a(7) =285a(8) =285a(9) =15a(10) =90a(11) =3354a(12) =10824a(13) =3354a(14) =90a(15) =357a(16) =27521a(17) =234484a(18) =234484a(19) =27521a(20) =357a(21) =1107a(22) =175881a(23) =3739008a(24) =10776210a(25) =3739008a(26) =175881a(27) =1107a(28) =2907a(29) =932205

External references