25795

Appears in sequences

• Expansion of x/(1 - 7*x - 6*x^2).at n=6A015564
• Quasi-Carmichael numbers to base 3: squarefree composites n such that prime p|n ==> p-3|n-3.at n=9A029560
• a(n) = A051193(A072109(n))/A018804(A072109(n)).at n=4A071645
• Expansion of (sqrt(1+3*x)-sqrt(1-5*x))/(4*x*sqrt(1-x)).at n=9A098465
• Number of partitions of n such that 2*(least part) < greatest part.at n=37A237820
• G.f. = b(2)*b(4)*b(6)/(x^8+x^6-x^5-x^3-x+1), where b(k) = (1-x^k)/(1-x).at n=21A266333
• a(n) = number of decimal digits of A007505(n).at n=41A275247
• a(n) = Sum_{k=1..n} (k^2*floor(k/2)).at n=20A285188
• a(n) = n*(n + 1)*(16*n - 1)/6.at n=21A304659
• Number of compositions (ordered partitions) of n into centered heptagonal numbers (A069099).at n=52A322803
• Sum_{n>=0} a(n) * x^n / (n!)^2 = exp(x) * BesselI(0,2*sqrt(1 - exp(x))).at n=6A336589
• Expansion of 1/(1 - x/(1 - 4*x)^(3/2))^2.at n=6A382541