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A258388
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a(n) = n^(n+1) + (n-1)^n.
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1
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1, 1, 9, 89, 1105, 16649, 295561, 6044737, 139982529, 3621002129, 103486784401, 3238428376721, 110131633755793, 4044369591078361, 159505471943511513, 6723976451270702849, 301716313535065716481, 14358232357247077816865, 722298429807405401348641
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listen;
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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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E.g.f.: 1/(1 + W(-x))^3 - 1/(1 + W(-x))^2 - x/(W(-x)*(1+W(-x))) where W is the Lambert W function. (End)
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EXAMPLE
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a(3) = 3^(3+1) + (3-1)^3 = 3^4 + 2^3 = 81 + 8 = 89.
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MAPLE
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a:= n-> n^(n+1)+(n-1)^n:
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MATHEMATICA
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PROG
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(Sidef)
func a(n) {
(n-1)**n + n**(n+1)
};
1.to(Math.inf).each { |n|
say a(n);
};
(PARI) vector(10, n, n^(n+1)+(n-1)^n) \\ Derek Orr, Jun 01 2015
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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