27377

Appears in sequences

• a(n) = T(n, n-2), where T is given by A026519. Also number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 2.at n=12A026522
• a(n) = T(n,n-2), T given by A026536. Also a(n) = number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 2.at n=12A026539
• a(n) = 18*n^2 - 1.at n=38A157910
• Sum of the numbers already removed (including the target number) in the first jump of a Sieve of Eratosthenes table.at n=34A179654
• p-INVERT of (-1 + 2^n), where p(S) = 1 - S - S^2.at n=7A289798
• Irregular triangle read by rows: T(n,m) = number of lattice paths of type {B^H}_R terminating at point (n, m).at n=51A291084
• Number of binary necklaces with n beads and at least four consecutive black beads.at n=19A351361
• Number of irredundant sets in the n-trapezohedral graph.at n=6A391916