1544192

Appears in sequences

• a(n) = 2*a(n-1) + 4*a(n-2); with a(0)=1, a(1)=4.at n=12A087206
• a(n) = 4^(n-1)*U(n-1, 3/2) where U is the Chebyshev polynomial of the second kind.at n=7A099157
• a(n) = -2*a(n-1)+4*a(n-2), n>1 ; a(0) = 1, a(1) = -4.at n=12A152174
• Number of subsets of {1, 2, 3, ..., n} that include no consecutive odd integers.at n=24A279245
• Number of subsets of {1, 2, 3, ..., n} that include no consecutive even integers.at n=24A279312
• G.f. A(x) satisfies: Sum_{n>=0} n * (x + (-1)^n*A(x))^n = 0.at n=6A318640