51129

Appears in sequences

• Denominator of 2*Sum(C(n,w)/(2*w+1),w=0..n/2-1)+C(n,n/2)/(n+1) if n is even, or of 2*Sum(C(n,w)/(2*w+1),w=0..(n-1)/2) if n is odd.at n=35A085569
• Partial sums of A055067 where A055067(n) is the product of non-divisors of n.at n=9A280713
• Expansion of Sum_{k>0} x^(2*k)/(1+x^k)^6.at n=21A363614
• a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(5*n-k,n-2*k).at n=5A371787
• k such that 0 = Sum_{j=1..k} A373223(k, j). The indices of the rows in Gauss's triangle with vanishing row sums.at n=40A373181