1293292

Appears in sequences

• Expansion of 1/(1-4*x)^(11/2).at n=6A020922
• Expansion of (1-4*x)^(21/2).at n=6A020933
• a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n and s(0) = 3. Also a(n) = Sum{T(n,k), k = 0,1,...,[ (n+3)/2 ]}, where T is defined in A026022.at n=21A026023
• Denominator of partial sums of a certain series.at n=5A101628
• Absolute value of coefficient of term [x^(n-5)] in characteristic polynomial of maximum matrix A of size n X n, where n >= 5. Maximum matrix A(i,j) is MAX(i,j), where indices i and j run from 1 to n.at n=10A112461
• Denominators of third-order harmonic numbers (defined by Conway and Guy, 1996).at n=21A124838
• Denominator of Sum_{k=1..n} k*H_{n+k} where H_m = Sum_{i=1..m} 1/i.at n=23A144655
• a(n) = 2 * C(2*n,n-1).at n=11A162551
• Second column of the extended Catalan triangle A189231.at n=22A238452
• Convolution of the generalized Catalan numbers A057977 with themselves.at n=21A239453
• Number of preferential arrangements of n labeled elements such that the minimal number of elements per rank equals 10.at n=12A245863
• a(n) is the number of ballot sequences of length n tied or won by at most 3 votes.at n=21A337500