Number of n X 1 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

A278547

Number of n X 1 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

Terms

    a(0) =0a(1) =0a(2) =4a(3) =65a(4) =456a(5) =2128a(6) =7728a(7) =23607a(8) =63460a(9) =154518a(10) =347568a(11) =732524a(12) =1461824a(13) =2784600a(14) =5095376a(15) =9002010a(16) =15418728a(17) =25691420a(18) =41763900a(19) =66395595a(20) =103443144a(21) =158220680a(22) =237956160a(23) =352364025a(24) =514357740a(25) =740929410a(26) =1054227720a(27) =1482869934

External references