Number of nX3 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.
A278773
Number of nX3 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.
Terms
- a(0) =0a(1) =20a(2) =266a(3) =1972a(4) =10784a(5) =48501a(6) =189595a(7) =665212a(8) =2138149a(9) =6384894a(10) =17895624a(11) =47447755a(12) =119746565a(13) =289136007a(14) =670787381a(15) =1500673676a(16) =3247602855a(17) =6817025467a(18) =13912884597a(19) =27665820296a(20) =53701416899a(21) =101922145950a(22) =189427147850
External references
- oeis: A278773