856080

Appears in sequences

• E.g.f. 1/(1-3x-x^2).at n=6A052595
• Denominators a(n) of Pythagorean approximations b(n)/a(n) to 3/2.at n=5A195550
• Numerators b(n) of Pythagorean approximations b(n)/a(n) to 2/3.at n=10A195560
• a(n) = Sum_{k = 0..n - 1} (a(n - 1) + k) for n>0, a(0) = 1.at n=9A266083
• Decimal representation of the middle column of the "Rule 126" elementary cellular automaton starting with a single ON (black) cell.at n=19A267367