1717986919

Appears in sequences

• Expansion of (1-x)/(1-2*x+x^2-2*x^3).at n=32A007909
• Positions of check bits in code in A075970.at n=3A075972
• a(n) = 3*a(n-1) + 4*a(n-2), a(0)=a(1)=1.at n=16A102900
• a(n) = a(n-1) + 2^(k(n)), where k(n) is the n-th term of the sequence formed by k(1)=0 together with the numbers A042963.at n=16A113870
• Number of n-step one-sided prudent walks, avoiding single west steps and single east steps.at n=31A190569
• The subsequence A247649(2^n-1).at n=30A255490
• Expansion of -x^2*(x^3+x-1) / ((x-1)*(x+1)*(2*x-1)*(x^2+1)).at n=33A256494
• Number of (n+2) X (1+2) 0..1 arrays with each row and column divisible by 5, read as a binary number with top and left being the most significant bits.at n=30A262267
• Decimal representation of the n-th iteration of the "Rule 214" elementary cellular automaton starting with a single ON (black) cell.at n=15A267805
• a(n) = (4^(n+1) + (-1)^n + 5)/10.at n=16A363773