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A032343 a(n) = 10*a(n-1)+n^2, a(0)=0. 1
0, 1, 14, 149, 1506, 15085, 150886, 1508909, 15089154, 150891621, 1508916310, 15089163221, 150891632354, 1508916323709, 15089163237286, 150891632373085, 1508916323731106, 15089163237311349, 150891632373113814 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n)/10^n converges to 110/729=0.15089163237311...

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

FORMULA

a(n) =(10^n-1)*(110/729)-n^2/9-n*(20/81).

G.f.: (x^2+x)/((x-1)^3*(10*x-1))  [Harvey P. Dale, Mar 20 2011]

MATHEMATICA

CoefficientList[Series[(x^2+x)/((x-1)^3 (10x-1)), {x, 0, 30}], x]  (* Harvey P. Dale, Mar 20 2011 *)

RecurrenceTable[{a[0] == 0, a[n] == 10*a[n-1] + n^2}, a, {n, 100}] (* Vincenzo Librandi, Mar 10 2013 *)

PROG

(MAGMA) [0] cat [n le 1 select n else 10*Self(n-1)+n^2: n in [1..20]]; // Vincenzo Librandi, Mar 10 2013

CROSSREFS

Cf. A014824, A019521.

Sequence in context: A162965 A067103 A081184 * A222614 A019521 A009614

Adjacent sequences:  A032340 A032341 A032342 * A032344 A032345 A032346

KEYWORD

nonn,easy

AUTHOR

Henry Bottomley, Jul 04 2000

STATUS

approved

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Last modified October 19 04:40 EDT 2019. Contains 328211 sequences. (Running on oeis4.)