946176

Appears in sequences

• Number of walks of length n on square lattice, starting at origin, staying on points with x+y >= 0.at n=11A060899
• Erroneous version of A008964.at n=6A063505
• a(n) = (3*0^n + 4^n*binomial(2*n,n))/4.at n=6A099045
• a(n) = Product_{k=0..n-1} A084057(k+1).at n=5A186269
• Constant term of the reduction (by x^2->x+1) of polynomial p(n,x) identified in Comments.at n=11A192350
• a(n) = 2^n*n!/((floor(n/2)+1)*floor(n/2)!^2).at n=11A240558
• a(n) is the number of subsets of {1..n} that contain exactly 5 odd numbers.at n=21A331420
• Irregular triangular array T; row n shows the coefficients of the (n-1)-st polynomial in the obverse convolution s(x)**t(x), where s(x) = x+F(n) and t(x) = x+F(n), and F(n) = n-th Fibonacci number (A000045). See Comments.at n=40A375049
• Numbers k for which sigma(k - x) + sigma(k + x) = 9*k has at least one nonnegative solution.at n=7A385075