-387

Appears in sequences

• Expansion of Product_{m>=1} 1/(1 + m*q^m)^9.at n=5A022701
• Matrix 9th power of inverse partition triangle A038498.at n=46A050312
• Generalized sum of divisors function: third diagonal of A060044.at n=22A060045
• Expansion of (1-x)^(-1)/(1-x-x^2+2*x^3).at n=21A077867
• First column in inverse of Euler phi sequence matrix.at n=25A106479
• G.f.: (x^3+6*x+2)^2/(x^2+x+1)^2.at n=42A115054
• G.f.: (x^3+6*x+2)^2/(x^2+x+1)^2.at n=44A115054
• Coefficients of a normalized Schwarzian derivative generating the Neretin polynomials: S(f) = (x^2/6) { D^2 log(f(x)) - (1/2) [D log(f(x))]^2 }.at n=25A145900
• Deleham triangle [1,1,-1,1,1,-1,1,...] DELTA [1,0,0,1,0,0,1,0,...], DELTA defined in A084938.at n=57A174014
• Triangle of coefficients of Gaussian polynomials [2n+3,3]_q represented as finite sum of terms (1+q^2)^k*q^(g-k), where k = 0,1,...,g with g=3n.at n=63A267120
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 389", based on the 5-celled von Neumann neighborhood.at n=11A271597
• Write 2*x/(1-x) in the form Sum_{j>=1} ((1-x^j)^a(j) - 1).at n=29A290973
• Expansion of 1 + x*(1-x)/(1 + x^2*(1-x^2)/(1 + x^3*(1-x^3)/(1 + x^4*(1-x^4)/(1 + x^5*(1-x^5)/(1 + ...))))), a continued fraction.at n=38A291193
• Expansion of 1 - x*(1+x)/(1 + x^2*(1-x^2)/(1 - x^3*(1+x^3)/(1 + x^4*(1-x^4)/(1 - x^5*(1+x^5)/(1 - ...))))), a continued fraction.at n=38A291200
• Expansion of Product_{k>=1} (1 + x^k/(1 + x^(2*k)/(1 + x^(3*k)))).at n=51A327718
• a(n) = Sum_{k=1..n} (-1)^k*k^2*floor(n/k).at n=22A366915
• Shifts left one place under the inverse modulo 2 binomial transform.at n=61A380652
• a(n) = A325977(A228058(n)).at n=38A389217