6020698domain: NAppears in sequencesFibonacci sequence beginning 2, 6.at n=30A022112Main diagonal of array in A038150.at n=13A047923Number of binary strings of length n with no substrings equal to 0000, 0001 or 1001.at n=31A164413Expansion of 2*(x+1)*(x^4+6*x^3+5*x^2+6*x+1)/(x^6-18*x^3+1).at n=15A247035