31090

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 47.at n=37A020386
• a(n) = s(1)*s(n) + s(2)*s(n-1) + ... + s(k)*s(n+1-k), where k = floor((n+1)/2), s = (Fibonacci numbers).at n=18A024458
• a(n) = Sum{T(n,k)*T(n,2n-k)}, 0<=k<=n-1, T given by A027926.at n=9A027991
• Convolution of Fibonacci F(n+1), n>=0, with F(n+10), n>=0.at n=9A067978
• Number of (n+2)X(4+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=14A254903
• Number of peaks in all bargraphs having semiperimeter n (n>=2).at n=10A271941