17294403

Appears in sequences

• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*7^j.at n=30A038273
• a(n) is the number of shapes of balanced trees with constant branching factor 7 and n nodes. The node is balanced if the size, measured in nodes, of each pair of its children differ by at most one node.at n=16A131893
• Triangle interpolating between the subsets of an n-set (A000079) and the trees on n labeled nodes (A000272) (read by rows).at n=33A154715
• a(n) = 3*7^n.at n=8A169634
• Numbers n such that the n-th cyclotomic polynomial has a root mod 7.at n=34A245479
• a(n) is the position of the first occurrence of n in A323077.at n=30A334198