

A014940


a(1)=1, a(n)=n*22^(n1)+a(n1).


3



1, 45, 1497, 44089, 1215369, 32137161, 825796489, 20780659593, 514663521417, 12587355699337, 304746506405001, 7316566123340937, 174431600326980745, 4133772410690139273, 97461091512107447433, 2287542179758700278921
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OFFSET

1,2


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200


FORMULA

a(n)=(1/441)*[1+22^n*(21*n1)], with n>=1 [From Paolo P. Lava, Jan 13 2009]
G.f.: x/((1x) (1+22 x)^2) [From Harvey P. Dale, Apr 21 2011]


MATHEMATICA

Table[(1+22^n (21n1))/441, {n, 20}] (* or *) CoefficientList[ Series[1/((1x) (1+22 x)^2), {x, 0, 20}], x] (* Harvey P. Dale, Apr 21 2011 *)


CROSSREFS

Sequence in context: A107399 A053112 A240686 * A273436 A049397 A215859
Adjacent sequences: A014937 A014938 A014939 * A014941 A014942 A014943


KEYWORD

nonn,easy


AUTHOR

Olivier Gérard


STATUS

approved



