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Search: id:A117338
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| 1, 2, 1, 4, -9, 62, -399, 3048, -26045, 247298, -2582027, 29416876, -363327081, 4837734374, -69105690039, 1054490587824, -17122237729589, 294828907099274, -5366869867749347, 102988994579465716, -2078107926978317889, 43988545301378533742
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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G.f.: A(x) = 1/(1-x)/[Sum_{n>=0} (-1)^n*n!*x^n].
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EXAMPLE
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A(x) = 1 + 2*x + x^2 + 4*x^3 - 9*x^4 + 62*x^5 - 399*x^6 +-...
= 1/(1-x)/(1 - x + 2*x^2 - 6*x^3 + 24*x^4 - 120*x^5 +-...)
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PROGRAM
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(PARI) a(n)=polcoeff(1/((1-x)*sum(k=0, n, (-1)^k*k!*x^k)+x*O(x^n)), n)
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CROSSREFS
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Cf. A117335 (triangle), A117336 (column 1), A117337 (column 2).
Sequence in context: A015943 A006445 A097949 this_sequence A137634 A100229 A071949
Adjacent sequences: A117335 A117336 A117337 this_sequence A117339 A117340 A117341
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KEYWORD
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sign
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Mar 09 2006
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