56849086

Appears in sequences

• Bisection of A000930.at n=24A002478
• Expansion of (1-x)^2/(1 - 4*x + 3*x^2 - x^3).at n=16A052544
• G.f.: 1/(1+x+x^3).at n=48A199804
• INVERT transform of [1, 0, 1, 3, 9, 27, 81, ...].at n=17A204200
• Number of compositions (ordered partitions) of n into odd divisors of n.at n=48A284466
• a(n) = Sum_{k=0..2*n} binomial(2*k,2*n-k).at n=12A391594