146046

Appears in sequences

• Number of polyhexes with n cells that tile the plane by translation.at n=16A075207
• a(n) = 2*a(n-1) + 5*a(n-2), with a(0) = 0, a(1) = 3.at n=10A083695
• a(n) = n! * Sum_{k=0..n} binomial(n+(n-1)*(k+1),n-k)/k!.at n=5A361617