199879

Appears in sequences

• Number of unlabeled heptagonal 2-trees with n heptagons.at n=8A094651
• Numbers n such that A160691(n)=12.at n=12A158963
• a(n) = 4*a(n-1) - 2*a(n-2) + a(n-3) - 4*a(n-4) + 2*a(n-5) for n >= 7, where a(1) = 1, a(2) = 2, a(3) = 4, a(4) = 12, a(5) = 38, a(6) = 127.at n=11A341240