5205950

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=18A026522
• 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=18A026539
• a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026519.at n=8A027264
• a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026536.at n=9A027269