93936domain: NAppears in sequencesPoincaré series [or Poincare series] P(C#_{5,2}; x).at n=13A124632a(n) = the smallest positive integer not yet occurring such that the number of divisors of Sum_{k=1..n} a(k) is exactly n.at n=25A175350Expansion of Product_{k>=1} (1 + x^k)^k / (1 + x^(4*k))^(4*k).at n=27A285292