250308

Appears in sequences

• 2*Sum(floor(C(n,w)/w),w=1..n/2-1)+floor(C(n,n/2)/(n/2)) if n is even, otherwise 2*Sum(floor(C(n,w)/w),w=1..(n-1)/2).at n=19A085573
• Numbers k such that k^2 divides 3*Fibonacci(k).at n=14A130164