161435domain: NAppears in sequencesa(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1.at n=29A024722Odd numbers n containing 65536 as the highest power of 2 in their Collatz (3x+1) iteration.at n=36A247716