37442160

Appears in sequences

• a(n) = binomial coefficient C(2n, n-1).at n=14A001791
• Number of unrooted triangulations with reflection symmetry of a disk with 2 internal nodes and n+3 nodes on the boundary.at n=26A005509
• Valence of graph of maximal intersecting families of sets.at n=27A007007
• Binomial coefficient C(28,n).at n=13A010944
• Binomial coefficient C(28,n).at n=15A010944
• a(n) = binomial(n,13).at n=15A010966
• a(n) = binomial(n,15).at n=13A010968
• 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=26A026023
• Theta series of (putative) extremal 3-modular even lattice in dimension 70.at n=6A034645
• a(n) = binomial(n, floor((n-1)/2)).at n=28A037952
• a(n) = binomial(n, floor(n/2)-1).at n=28A037955
• Distinct even numbers in writing first numerator and then denominator of each element of the 1/4-Pascal triangle (by row).at n=35A046589
• T(2n+2,n), array T as in A050186; a count of aperiodic binary words.at n=13A051195
• Expansion of (1+x)c(x^2)/((1-x^2*c(x^2))sqrt(1-4x^2)), c(x) the g.f. of A000108.at n=26A117187
• Expansion of (1+x)c(x^2)/((1-x^2*c(x^2))sqrt(1-4x^2)), c(x) the g.f. of A000108.at n=27A117187
• a(n) = (n!*m)/(m!*(m+1)!) where m = floor(n/2).at n=28A237884
• a(n) = A(n) if n is even else a(n) = A(n)*(n-1)/(n+1) with A(n) = ((n-1)!/ floor((n-1)/2)!^2).at n=28A274707