25246

Appears in sequences

• Trajectory of 3 under map n->27n+1 if n odd, n->n/2 if n even.at n=10A037111
• a(n) = A045820(n)/2.at n=18A045822
• a(1) = 1; a(n+1) = sum of terms in continued fraction for sum of continued fractions, [a(n); a(n-1), a(n-2),...,a(1)] and [0; a(n), a(n-1), a(n-2),...,a(1)].at n=15A058083
• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2 which is symmetric after a rotation by 180 degrees.at n=9A123763
• G.f. satisfies A(x) = 1 + Sum_{n>=1} x^n * A(x)^prime(n).at n=8A193074
• Expansion of Product_{k>=1} (1 + k*x^k)^k.at n=12A266891
• Expansion of Sum_{k>=1} k^3 * x^k/(1 - x^k)^3.at n=25A366135