-1880

Appears in sequences

• Matrix inverse of triangle A055140.at n=21A055141
• Expansion of e.g.f.: exp(x)*sqrt(1-2x).at n=6A055142
• Expansion of q * chi(-q) / chi(-q^5)^5 in powers of q where chi() is a Ramanujan theta function.at n=53A095813
• a(n) = prime(n+3)*prime(n) - prime(n+1)*prime(n+2).at n=45A117301
• Coefficients of polynomials from matrix characteristic polynomials: m(n,m,d)=If[ m <= n, Mod[Binomial[n, m], 2], 0]; M(n)=m(n,m,d).Transpose[m(n,m,d)].Transpose[m(n,m,d)].m(n,m,d).at n=52A158202
• Numerator of Hermite(n, 2/9).at n=3A159197
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 203", based on the 5-celled von Neumann neighborhood.at n=25A270728
• Expansion of (1-q)^k/Product_{j=1..k} (1-q^j) for k=8.at n=51A275642
• a(n) = t(n)*a(n-1) + a(n-2) for n>1 where t(n) is the Prouhet-Thue-Morse sequence A106400 with a(0)=0 and a(1)=1.at n=54A348112
• Expansion of 1 / Sum_{k in Z} x^(2*k) / (1 - x^(5*k+2)).at n=37A375061