280352

Appears in sequences

• Number of basic invariants for cyclic group of order and degree n.at n=30A002956
• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-1)*a(1) for n >= 5, with a(1) = 1, a(2) = a(3) = 0, a(4) = 1.at n=18A025276