-123

Appears in sequences

• Coefficients of the 3rd-order mock theta function f(q).at n=32A000025
• Coefficient of q^(2n) in the series expansion of Ramanujan's mock theta function f(q).at n=16A000039
• E.g.f. exp(log(1+x)*cos(x)).at n=9A009192
• Expansion of tanh(tanh(x)*exp(x)).at n=5A009822
• sec(sinh(x)*cos(x))=1+1/2!*x^2-3/4!*x^4-123/6!*x^6-455/8!*x^8...at n=3A012569
• Expansion of e.g.f.: tanh(exp(x) - cos(x)) = x + (2/2!)*x^2 - (1/3!)*x^3 - (24/4!)*x^4 - (123/5!)*x^5 + ...at n=5A013317
• Expansion of Product_{m>=1} (1+q^m)^(-3).at n=13A022598
• Matrix 9th power of inverse partition triangle A038498.at n=58A050312
• a(n) = n^2 - primefloor(n)*primeceiling(n).at n=30A056139
• a(n) = n^2 - previousprime(n)*nextprime(n), for n>2.at n=29A056140
• Low-temperature magnetization expansion for honeycomb net (Potts model, q=3).at n=6A057390
• McKay-Thompson series of class 46A for the Monster group.at n=51A058688
• a(n) = floor(sin(n)*cos(2*n)^2*tan(4*n)^3).at n=1A062233
• Expansion of (1-2*x)/(1+x-x^2).at n=9A075193
• Sum of Lucas numbers and inverted Lucas numbers: a(n) = A000032(n)*A075193(n).at n=11A075270
• Numerator of 1 - Sum_{i=1..n} |Bernoulli(i)|.at n=13A100651
• Numerator of 1 - Sum_{i=1..n} |Bernoulli(i)|.at n=12A100651
• Expansion of 1/(1-x^2(1-3x)).at n=11A106855
• Expansion of (1 - x)*(1 + x)^2*(1 + x^2)*(1 - x^2 + 2*x^3 + x^4) / ((1 - x^2 - x^4)*(1 + x^2 + 2*x^4 - x^6 + x^8)).at n=20A107363
• Riordan array ((1-x^2)/(1+3x+x^2),x/(1+3x+x^2)).at n=15A110168