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 A025211 Expansion of 1/((1-2x)(1-3x)(1-4x)(1-5x)). 5
 1, 14, 125, 910, 5901, 35574, 204205, 1132670, 6129101, 32566534, 170691885, 885423630, 4556561101, 23305343894, 118631189165, 601616805790, 3042056477901, 15346559343654, 77279066272045, 388583895311150, 1951684190615501, 9793511186181814, 49108010998116525 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS This gives the fourth column of the Sheffer triangle A143494 (2-restricted Stirling2 numbers). See the e.g.f. given below, and comments on the general case under A193685. - Wolfdieter Lang, Oct 08 2011 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..500 Index entries for linear recurrences with constant coefficients, signature (14,-71,154,-120) FORMULA If we define f(m,j,x) = Sum_{k=j..m} binomial(m,k)*stirling2(k,j)*x^(m-k) then a(n-3) = (-1)^(n-1)*f(n,3,-5), (n >= 3). - Milan Janjic, Apr 26 2009 If we define f(m,j,x) = Sum_{k=j..m} binomial(m,k)*stirling2(k,j)*x^(m-k) then a(n-3) = f(n,3,2), (n >= 3). - Milan Janjic, Apr 26 2009 a(n) = 3^(n+3)/2 - 2*4^(n+2) - 2^(n+2)/3 + 5^(n+3)/6. - R. J. Mathar, Mar 22 2011 O.g.f.: 1/((1-2*x)*(1-3*x)*(1-4*x)*(1-5*x)). E.g.f.: (d^3/dx^3) (exp(2*x)*((exp(x)-1)^3)/3!). See the Sheffer comment given above. - Wolfdieter Lang, Oct 08 2011 MATHEMATICA CoefficientList[Series[1/((1 - 2 x) (1 - 3 x) (1 - 4 x) (1 - 5 x)), {x, 0, 25}], x] (* Vladimir Joseph Stephan Orlovsky, Jun 20 2011 *) LinearRecurrence[{14, -71, 154, -120}, {1, 14, 125, 910}, 30] (* Harvey P. Dale, Feb 05 2020 *) PROG (MAGMA) [3^(n+3)/2 -2*4^(n+2)-2^(n+2)/3+5^(n+3)/6: n in [0..30]]; // Vincenzo Librandi, Jun 21 2011 (PARI) a(n)=n-=2; 3^n*3/2-2*4^n-2^n/3+5^n*5/6 \\ Charles R Greathouse IV, Jun 21 2011 CROSSREFS Cf. A000079, A001047, A016269. Sequence in context: A126535 A222647 A041001 * A026870 A090296 A088625 Adjacent sequences:  A025208 A025209 A025210 * A025212 A025213 A025214 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified April 17 08:40 EDT 2021. Contains 343064 sequences. (Running on oeis4.)