30863

Appears in sequences

• a(n) = T(n, n-1), T given by A026519. Also a(n) = number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 1.at n=13A026521
• a(n) = T(n,n-1), T given by A026536. Also a(n) = number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 1.at n=13A026538
• Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic residues mod p that are < p/2.at n=33A282721
• Irregular triangle read by rows: T(n,m) = number of lattice paths of type {B^H}_R terminating at point (n, m).at n=50A291084