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A014940
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a(1)=1, a(n)=n*22^(n-1)+a(n-1).
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1
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1, 45, 1497, 44089, 1215369, 32137161, 825796489, 20780659593, 514663521417, 12587355699337, 304746506405001, 7316566123340937, 174431600326980745, 4133772410690139273, 97461091512107447433, 2287542179758700278921
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..200
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FORMULA
| a(n)=(1/441)*[1+22^n*(21*n-1)], with n>=1 [From Paolo P. Lava (paoloplava(AT)gmail.com), Jan 13 2009]
G.f.: x/((1-x) (-1+22 x)^2) [From Harvey P. Dale, Apr 21 2011]
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MATHEMATICA
| Table[(1+22^n (21n-1))/441, {n, 20}] (* or *) CoefficientList[ Series[1/((1-x) (-1+22 x)^2), {x, 0, 20}], x] (* From Harvey P. Dale, Apr 21 2011 *)
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CROSSREFS
| Sequence in context: A035521 A107399 A053112 * A049397 A143170 A203828
Adjacent sequences: A014937 A014938 A014939 * A014941 A014942 A014943
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KEYWORD
| nonn,easy
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AUTHOR
| Olivier Gerard (olivier.gerard(AT)gmail.com)
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