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

A278379

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

Terms

    a(0) =0a(1) =0a(2) =3a(3) =40a(4) =267a(5) =1350a(6) =5936a(7) =23565a(8) =84912a(9) =278422a(10) =835824a(11) =2316601a(12) =5980937a(13) =14503972a(14) =33282396a(15) =72732358a(16) =152195016a(17) =306378420a(18) =595704701a(19) =1122541470a(20) =2056128263a(21) =3670127802a(22) =6398217740a(23) =10915088955a(24) =18252749400a(25) =29965289850

External references