Number of n X 2 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

A278319

Number of n X 2 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

Terms

    a(0) =0a(1) =3a(2) =20a(3) =94a(4) =395a(5) =1492a(6) =4991a(7) =14848a(8) =39832a(9) =97835a(10) =223015a(11) =477126a(12) =966849a(13) =1869504a(14) =3470210a(15) =6214384a(16) =10780448a(17) =18178763a(18) =29884150a(19) =48010910a(20) =75541039a(21) =116618372a(22) =176923705a(23) =264148560a(24) =388588200a(25) =563877795a(26) =807899313a(27) =1143890790a(28) =1601794149

External references