22131

Appears in sequences

• Number of 3-connected nets with n edges.at n=14A002880
• A Collatz-Fibonacci mixture: a(1) = 1, a(2) = 2, a(n+2) = a(n+1)/2+a(n)/2 if a(n+1) and a(n) have the same parity, a(n+2) = a(n+1)+a(n) otherwise.at n=41A069202
• a(n+1)-+a(n)=prime, a(n+1)*a(n)=Average of twin prime pairs, a(1)=3,a(2)=10.at n=32A154496
• Pseudoprimes to base 5, written in base 5.at n=5A262102
• Number of triangular regions in an equilateral triangular "frame" of size n (see Comments in A328526 for definition).at n=16A333032