Highest power of 9 dividing A068943(n) for n>0.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =7a(5) =28a(6) =108a(7) =414a(8) =1585a(9) =6087a(10) =23446a(11) =90532a(12) =350343a(13) =1358437a(14) =5276545a(15) =20527950a(16) =79976007a(17) =311984922a(18) =1218474389a(19) =4763911699a(20) =18643889114a(21) =73029856058a(22) =286302435505