81413

Appears in sequences

• Fibonacci sequence beginning 4, 17.at n=19A022134
• a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n+1-k), where k = floor((n+1)/2), s = A023531, t = (Lucas numbers).at n=23A024319
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023531, t = (Lucas numbers).at n=22A024882
• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 13.at n=39A051978
• G.f.: A(x) = Sum_{n>=0} x^n*(A(n*x) + A(-n*x))/2.at n=9A196196