-23

Appears in sequences

• Canonical enumeration of integers: interleaved positive and negative integers with zero prepended.at n=46A001057
• The negative integers.at n=22A001478
• Expansion of (Product_{j>=1} (1-(-x)^j) - 1)^4 in powers of x.at n=16A001482
• a(n) = -n.at n=23A001489
• Coefficient of x^p (p = n-th prime) in x * Product_{k>=1} (1-x^k)^2*(1-x^11k)^2.at n=53A002070
• a(1) = 0, a(2) = -2; for n > 2, a(n) + a(n-2) - a(n-3) - a(n-5) - ... - a(n-p) = (-1)^(n+1)*n if n is prime, otherwise = 0, where p = largest prime < n.at n=22A002120
• Expansion of a modular function for Gamma_0(6).at n=4A002507
• Numerators of coefficients for repeated integration.at n=3A002681
• Elliptic divisibility sequence associated with elliptic curve "37a1": y^2 + y = x^3 - x and multiples of the point (0,0).at n=11A006769
• G.f.: Product_{k>0} (1-x^(5k-1))*(1-x^(5k-4))/((1-x^(5k-2))*(1-x^(5k-3))).at n=44A007325
• Numerators of Taylor series for 1/(sin x + tan x).at n=2A008961
• Expansion of e.g.f: (1+x)*cos(x).at n=23A009001
• Expansion of e.g.f.: 1/cos(sin(x)) (even-indexed coefficients only).at n=3A009008
• Expansion of e.g.f. cos(x*exp(x)).at n=4A009017
• Expansion of e.g.f.: exp(sin(x)*cos(x)).at n=5A009210
• Expansion of e.g.f.: exp(sinh(x)*cos(x)).at n=6A009228
• Expansion of e.g.f.: exp(sinh(x)*cos(x)).at n=5A009228
• E.g.f. exp( sinh(x) / exp(x) ) = exp( (1-exp(-2*x))/2 ).at n=5A009235
• Expansion of log(1+log(1+x))*cos(x).at n=4A009313
• Expansion of log(1+log(1+x))/cosh(x).at n=4A009317