Number of n X 2 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.

A278670

Number of n X 2 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.

Terms

    a(0) =1a(1) =8a(2) =33a(3) =99a(4) =245a(5) =532a(6) =1050a(7) =1926a(8) =3333a(9) =5500a(10) =8723a(11) =13377a(12) =19929a(13) =28952a(14) =41140a(15) =57324a(16) =78489a(17) =105792a(18) =140581a(19) =184415a(20) =239085a(21) =306636a(22) =389390a(23) =489970a(24) =611325a(25) =756756a(26) =929943a(27) =1134973a(28) =1376369a(29) =1659120

External references