31797domain: NAppears in sequencesNumber of positive integers <= 2^n of form 9 x^2 + 10 y^2.at n=19A054194a(0)=1. a(n) = Sum_{k=1..n} a(n-d(k)), where d(k) = A000005(k) (the number of positive divisors of k).at n=12A135346Composite numbers for which A324644(n)/A324198(n) = 2 and sigma(n) == 2 (mod 4).at n=28A371082