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A003017
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Expansion of 1/(1 - x*exp(x) + x^2*exp(2*x) - x^3*exp(3*x)).
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0
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1, 1, 2, 3, 28, 605, 9366, 116767, 1310408, 15812505, 263924650, 6018875291, 148630870092, 3548481410773, 82543469312318, 2000101425252855, 54347539111582096, 1678367049470539697, 56020955060945897298
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = sum(sum(k^(n-k)/(n-k)!*sum(binomial(j,k-3*m+2*j)*(-1)^(k-3*m+2*j)*binomial(m,j),j,0,m),k,m,n),m,1,n), n>0. - Vladimir Kruchinin, Aug 20 2010
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PROG
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(Maxima) a(n):=sum(sum(k^(n-k)/(n-k)!*sum(binomial(j, k-3*m+2*j)*(-1)^(k-3*m+2*j)*binomial(m, j), j, 0, m), k, m, n), m, 1, n); /* Vladimir Kruchinin, Aug 20 2010 */
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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