23589

Appears in sequences

• Number of isolated-pentagon (IPR) fullerenes with 2n vertices (or carbon atoms).at n=33A046880
• Expansion of (1-x) * (1+x) / ((1-2*x)*(1-x-x^2)).at n=13A104004
• Triangle, read by rows, where T(n,k) is the coefficient of q^(nk-k) in the squared q-factorial of n.at n=23A129276
• Triangle, read by rows, where T(n,k) is the coefficient of q^(nk-k) in the squared q-factorial of n.at n=25A129276
• Column 2 of triangle A129276; a(n) is the coefficient of q^(2n+2) in the squared q-factorial of n+2.at n=4A129278
• Sum of two integers when equal to the product of their prime-counting functions.at n=52A272861
• p-INVERT of (1,0,0,0,0,1,0,0,0,0,0,0,...), where p(S) = 1 - S^2.at n=45A292403
• Expansion of e.g.f. sqrt(1 - log(1 - 2*x)).at n=7A352075