109560

Appears in sequences

• Number of ways to lace a shoe with n eyelet pairs such that there is no direct "horizontal" connection between any adjacent eyelet pair.at n=3A072503
• Prime(prime(n))^2-1.at n=18A092771
• a(n) = 24*p(n) = 24*A000041(n).at n=29A183008
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S)^2 (1 - 2 S).at n=11A291238