22803

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers >= 2), t = (F(2), F(3), F(4), ...).at n=15A024874
• p^2 + 2 where p is a prime.at n=35A061725
• Number of primes between A001605(n) and A001605(n+1).at n=48A134851
• Number of tatami tilings of an 8 X n grid (with monomers allowed).at n=12A192094
• a(n) = sum_(d|n) product_(d_x|n, d_x<=d) d_x.at n=27A220848
• Number of partitions p of n such that the number of distinct parts is a part and max(p) - min(p) is not a part.at n=44A241389
• E.g.f. A(x,y) = cos((x - x*y)/2) / cos((x + x*y)/2) represented as a triangle, read by rows, where row n lists of coefficients T(n,k) of x^(2*n)*y^k/n! in A(x,y), for k=0..2*n.at n=38A272481
• E.g.f. A(x,y) = cos((x - x*y)/2) / cos((x + x*y)/2) represented as a triangle, read by rows, where row n lists of coefficients T(n,k) of x^(2*n)*y^k/n! in A(x,y), for k=0..2*n.at n=46A272481
• G.f. A(x) satisfies: A(x) = 1/(1 - x*A(x)/(1 - x*A(x)/(1 - x^2*A(x)/(1 - x^2*A(x)/(1 - x^3*A(x)/(1 - x^3*A(x)/(1 - ...))))))), a continued fraction.at n=8A301412