-819
domain: Z
Appears in sequences
- a(n) = (1 - (-4)^n)/5.at n=5A014985
- q-factorial numbers for q=-10.at n=3A015025
- Triangle of q-binomial coefficients for q=-4.at n=22A015112
- Triangle of q-binomial coefficients for q=-4.at n=26A015112
- Gaussian binomial coefficient [ n,5 ] for q = -4.at n=1A015308
- Sum_{d divides n} d^2*(-1)^bigomega(d), where bigomega(n) = A001222(n).at n=31A076792
- Expansion of 1/(1-x+2*x^3).at n=20A077950
- Expansion of 1/(1-x+2*x^3).at n=22A077950
- Expansion of 1/(1+x-2*x^3).at n=20A077973
- Expansion of 1/(1+x-2*x^3).at n=22A077973
- Expansion of 1/(1+x-2*x^3).at n=23A077973
- a(n) = (n+1)*(2-n)/2.at n=41A080956
- a(n) = Sum[d|n, d==1 (mod 3), d^2] - Sum[d|n, d==2 (mod 3), d^2].at n=31A103440
- Row sums of triangle A118407.at n=23A118408
- Numerators of triangle T(n,k), n>=0, 0<=k<=n, read by rows: T(n,k) is the coefficient of x^(2k+1) in polynomial t_n(x), used to define continuous and n times differentiable sigmoidal transfer functions.at n=26A144815
- Let c(n) = x^(2^n-1)*(1-x^(2^n)), g(n) = 1 + x^(2^n-1) + x^(2^n), h(n) = Product_{i=1..n} g(i); then use g.f. (1+2*x) - Sum_{n>=1} c(n)/h(n).at n=50A151684
- Hankel transform of A052702.at n=42A160705
- Expansion of (b(q^3)^3 - b(q)^3) / 9 in powers of q where b() is a cubic AGM theta function.at n=31A181905
- Expansion of o.g.f. (1-x^2)/(1-x+x^4).at n=41A193884
- Expansion of g.f. 1+x+(1+3*x+x^2)/(1+x)^3.at n=40A201163