-887

Appears in sequences

• cos(arctanh(x)*cos(x))=1-1/2!*x^2+5/4!*x^4-85/6!*x^6-887/8!*x^8...at n=4A012743
• exp(cosh(x)*arctan(x))=1+x+1/2!*x^2+2/3!*x^3+5/4!*x^4+20/5!*x^5...at n=8A012768
• Row sums of signed triangle A062139 (generalized a=2 Laguerre).at n=6A062197
• Alternating row sums of array A090438 ((4,2)-Stirling2).at n=3A090439
• Expansion of x^2*(-3+4*x)/(1-x^3+x^4).at n=38A110061
• a(n) = -n^2 + 9*n + 23.at n=35A126719
• Expansion of (chi(q^3) / chi(q))^6 + q / (chi(q^3) / chi(q))^6 in powers of q where chi() is a Ramanujan theta function.at n=7A156215
• Let f(x) = 1 + x^2 + x^4 + x^5 + x^6 + x^10 + x^11; sequence has g.f. g(x) = 1/(x^11*f(1/x)).at n=25A157876
• Values of n such that L(3) and N(3) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=26A226923
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 49", based on the 5-celled von Neumann neighborhood.at n=17A270017
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 307", based on the 5-celled von Neumann neighborhood.at n=17A271167
• G.f.: 1/(1 + x/(1 + 2*x^2/(1 + 3*x^3/(1 + 4*x^4/(1 + 5*x^5/(1 + 6*x^6/(1 + ... ))))))), a continued fraction.at n=26A285409