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A147623 The 3rd Witt transform of A040000. 1
0, 2, 6, 12, 22, 34, 48, 66, 86, 108, 134, 162, 192, 226, 262, 300, 342, 386, 432, 482, 534, 588, 646, 706, 768, 834, 902, 972, 1046, 1122, 1200, 1282, 1366, 1452, 1542, 1634, 1728, 1826, 1926, 2028, 2134, 2242, 2352, 2466, 2582, 2700, 2822, 2946, 3072 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The 2nd Witt transform of A040000 is represented by A042964.

LINKS

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

Pieter Moree, The formal series Witt transform, Discr. Math. no. 295 vol. 1-3 (2005) 143-160.

Index entries for linear recurrences with constant coefficients, signature (2, -1, 1, -2, 1).

FORMULA

G.f.: 2*x*(1+x)*(1+x^2)/((1-x)^3*(1+x+x^2)).

a(n) = 2*A071619(n).

MATHEMATICA

CoefficientList[Series[2 x (1 + x) (1 + x^2)/((1 - x)^3 (1 + x + x^2)), {x, 0, 40}], x] (* Vincenzo Librandi, Dec 14 2012 *)

CROSSREFS

Sequence in context: A046960 A126428 A187490 * A232234 A045964 A005819

Adjacent sequences:  A147620 A147621 A147622 * A147624 A147625 A147626

KEYWORD

nonn,easy

AUTHOR

R. J. Mathar, Nov 08 2008

STATUS

approved

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Last modified March 23 02:42 EDT 2019. Contains 321422 sequences. (Running on oeis4.)