45622domain: NAppears in sequencesNumbers n such that Catalan(n)+1 is prime.at n=41A053429a(0) = 1. a(n+1) = sum{k=0 to n} a(n-k)*a(ceiling(k/2)).at n=15A127681a(n) = Sum_{k=1..n} phi(k)*phi(k+1)*phi(k+2), where phi(k) = A000010(k) is Euler's totient function.at n=29A335131