1096286

Appears in sequences

• Number of self-complementary 2-colored bracelets (turnover necklaces) with 2n beads.at n=21A007148
• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=6, k=0 and l=-2.at n=9A177168