70661domain: NAppears in sequencesNumber of strings of n+2 numbers x(i) in -1..1 with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other.at n=11A184053Numbers that can be written in more than 1 way as p^2 + 3pq + q^2 with primes p < q.at n=30A218795