A133953 - OEIS

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A133953

Expansion of 2*x*(1+x)*(1-2*x)/((1-x)^2*(1-2*x-x^2)).

0

2, 6, 12, 24, 50, 110, 252, 592, 1410, 3382, 8140, 19624, 47346, 114270, 275836, 665888, 1607554, 3880934, 9369356, 22619576, 54608434, 131836366, 318281084, 768398448, 1855077890, 4478554134, 10812186060, 26102926152, 63018038258

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..29.

FORMULA

G.f.: 2*x*(1+x)*(1-2*x)/((1-x)^2*(1-2*x-x^2)). [Colin Barker, Feb 28 2012]

CROSSREFS

Sequence in context: A309841 A132176 A197469 * A350293 A122863 A170935

Adjacent sequences: A133950 A133951 A133952 * A133954 A133955 A133956

KEYWORD

nonn,easy,less

AUTHOR

Roger L. Bagula, Jan 08 2008

EXTENSIONS

Meaningful name from Joerg Arndt, Dec 26 2022

STATUS

approved