419431

Appears in sequences

• Expansion of (1-x)/(1-2*x+x^2-2*x^3).at n=20A007909
• Expansion of (1-x)^(-1)/(1-x+2*x^3).at n=40A077870
• a(n) = 3*a(n-1) + 4*a(n-2), a(0)=a(1)=1.at n=10A102900
• 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=10A113870
• Row sums of triangle A118407.at n=41A118408
• Inverse binomial transform of 1, 2, 2, 4, 10, 20, ... = A100088.at n=38A137470
• Number of n-step one-sided prudent walks, avoiding single west steps and single east steps.at n=19A190569
• The subsequence A247649(2^n-1).at n=18A255490
• Expansion of -x^2*(x^3+x-1) / ((x-1)*(x+1)*(2*x-1)*(x^2+1)).at n=21A256494
• 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=18A262267
• Decimal representation of the n-th iteration of the "Rule 214" elementary cellular automaton starting with a single ON (black) cell.at n=9A267805
• a(0)=1, a(1)=0, a(4n+2) = a(4n+3) = a(4n+5) = (4^(n+1) +(-1)^n)/5, a(4n+4) = (2*4^(n+1) -3*(-1)^n)/5.at n=40A274845
• a(n) is the least number k such that A066323(k) = n.at n=31A342728
• a(n) = (4^(n+1) + (-1)^n + 5)/10.at n=10A363773