8138021

Appears in sequences

• a(n) = (1 - (-5)^n)/6.at n=10A014986
• Gaussian binomial coefficient [ n,10 ] for q=-5.at n=1A015391
• Linear 2nd order recurrence: a(n) = 4*a(n-1) + 5*a(n-2).at n=11A015531
• Cyclotomic polynomials at x=5.at n=22A019323
• Cyclotomic polynomials at x=-5.at n=11A020504
• Zsigmondy numbers for a = 5, b = 1: Zs(n, 5, 1) is the greatest divisor of 5^n - 1^n (A024049) that is relatively prime to 5^m - 1^m for all positive integers m < n.at n=21A064081
• a(n) = (5*5^n + (-1)^n)/6.at n=10A083425
• Expansion of (1-4*x-x^2)/((1-x)*(1-4*x-5*x^2)).at n=11A100284
• a(n) = (n^(2*n+1) + 1) / (n+1).at n=5A179897
• a(n) = Sum_{j=0..10} (-n)^j.at n=5A269486
• a(n) = p(0,n), where p(x,n) is the strong divisibility sequence of polynomials based on sqrt(5) as in A327322.at n=10A329011
• Square array A(n,k) = (n^(2*k + 1) + 1)/(n + 1), n >= 0, k >= 0, read by antidiagonals.at n=60A362783