20321

Appears in sequences

• Where records appear in A109734.at n=36A109740
• Number of (w,x,y) with all terms in {0,...,n} and 2|w-x| >= max(w,x,y)-min(w,x,y).at n=30A213388
• Number of numbers in row n of the array at A243925.at n=28A243927
• Number of times n occurs in the sequence floor(log_Pi(i)) with i=1,2,3,... .at n=7A247168
• G.f. satisfies: A(x) = Sum_{n>=0} x^n * Sum_{k=0..n} x^k * {[x^k] A(x)^(4*n)}.at n=8A249937
• G.f. A(x) satisfies: A(x) = (1/(1 - x)) * A(x^2)*A(x^3)*A(x^5)* ... *A(x^prime(k))* ...at n=33A308271
• Numbers k such that both k and k+2 are de Polignac numbers (A006285).at n=31A330284
• Expansion of the Jacobi elliptic function cn(x,k) at k = 2 (even powers only).at n=4A370543
• Number of minimal edge cuts in the n-antiprism graph.at n=16A378922