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2, 1, 7, 2, 13, 3, 19, 4, 25, 5, 31, 6, 37, 7, 43, 8, 49, 9, 55, 10, 61, 11, 67, 12, 73, 13, 79, 14, 85, 15, 91, 16, 97, 17, 103, 18, 109, 19, 115, 20, 121, 21, 127, 22, 133, 23, 139, 24, 145
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..49.
Index entries for linear recurrences with constant coefficients, signature (0,2,0,-1).
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FORMULA
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G.f.: x*(x^4+3*x^2+x+2) / ((x-1)^2*(x+1)^2). - Colin Barker, Mar 04 2013
a(n) = -1+(-1)^n-1/4*(-7+5*(-1)^n)*n for n>1. a(n) = 2*a(n-2)-a(n-4) for n>5. - Colin Barker, Apr 06 2013
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CROSSREFS
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Cf. A152978, A160117 A160411, A160417.
Sequence in context: A239155 A097411 A134929 * A295734 A197328 A136535
Adjacent sequences: A160410 A160411 A160412 * A160414 A160415 A160416
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KEYWORD
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nonn,easy
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AUTHOR
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Omar E. Pol, Jun 13 2009
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EXTENSIONS
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More terms from Colin Barker, Apr 06 2013
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STATUS
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approved
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