20132659

Appears in sequences

• a(1) = a(2) = 1, a(2n + 1) = 2*a(2n) and a(2n) = 2*a(2n - 1) + (-1)^n.at n=25A016029
• Expansion of (1-x)/(1+2*x+x^2+2*x^3).at n=24A078066
• a(n) = 3a(n-1) + 4a(n-2), a(0) = 1, a(1) = 5.at n=12A108981
• Decimal equivalent of number defined by last k bits of the infinite binary string ...0011001100110011 (numbers with leading zeros omitted).at n=12A112627
• a(n) = (3/5)*2^(4n+1) - (1/5).at n=6A182460
• The subsequence A247649(2^n-1).at n=23A255490
• Decimal representation of the middle column of the "Rule 147" elementary cellular automaton starting with a single ON (black) cell.at n=24A262864
• Numbers n such that ror(n) + rol(n) is a power of 2, where ror(n)=A038572(n) is n rotated one binary place to the right, rol(n)=A006257(n) is n rotated one binary place to the left.at n=18A273180
• a(n) = a(n-2) + 4*a(n-3) - 4*a(n-5), where a(0) = 1, a(1) = 4, a(2) = 7, a(3) = 12, a(4) = 19, a(5) = 28.at n=34A297554
• a(n) = a(n-1) + 16*a(n-3) - 16*a(n-4), where a(0) = 1, a(1) = 4, a(2) = 7, a(3) = 19.at n=18A297556