145561

Appears in sequences

• a(1)=1, a(n+1) = a(n) + spf(Sum_{i=1..n} a(i)), where spf=A020639 (smallest prime factor).at n=36A080180
• a(n) = (n+1)*Sum_{i=0..n/2}((binomial(n-i,i))*binomial(2*(n-2*i),(n-2*i))/(n-2*i+1)^2).at n=11A270595