80872

Appears in sequences

• Expansion of eta(q^2)^4 / eta(q)^8 in powers of q.at n=9A284286
• Number of connected undirected unlabeled loopless multigraphs with 4 vertices and n edges.at n=44A290778
• a(n) is the least positive number k such that the product of the first n primes that are congruent to 1 (mod 4) is equal to y^2 - k^2 for some integer y.at n=8A350813