118665domain: NAppears in sequences"BIK" (reversible, indistinct, unlabeled) transform of 1,3,5,7...at n=11A032127a(n) = 2 + floor((1 + Sum_{j=1..n-1} a(j))/3).at n=38A120149a(0)=20, a(1)=9; for n >= 0, a(n+2) = 7*a(n+1) + 9*a(n).at n=5A136010