login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A014940 a(1)=1, a(n)=n*22^(n-1)+a(n-1). 3
1, 45, 1497, 44089, 1215369, 32137161, 825796489, 20780659593, 514663521417, 12587355699337, 304746506405001, 7316566123340937, 174431600326980745, 4133772410690139273, 97461091512107447433, 2287542179758700278921 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

FORMULA

a(n)=(1/441)*[1+22^n*(21*n-1)], with n>=1 [From Paolo P. Lava, Jan 13 2009]

G.f.: x/((1-x) (-1+22 x)^2) [From Harvey P. Dale, Apr 21 2011]

MATHEMATICA

Table[(1+22^n (21n-1))/441, {n, 20}] (* or *) CoefficientList[ Series[1/((1-x) (-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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 2 10:57 EDT 2020. Contains 334771 sequences. (Running on oeis4.)