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A085457 Sum(Sum a(j)a(i-j),(j=0,..,i)),(i=0,..,n)=(-11)^n. 0
1, -6, 48, -438, 4206, -41586, 418980, -4277130, 44089320, -457891170, 4783741248, -50218890738, 529300238574, -5597562756894, 59366869030668, -631200956847558, 6725615443683870, -71800018913609970, 767806202604650880, -8223081959016322530, 88187484604146004506 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

FORMULA

G.f.: A(x)=Sqrt((1-x)/(1+11x))

MATHEMATICA

CoefficientList[Series[Sqrt[(1-x)/(1+11 x)], {x, 0, 20}], x]

CROSSREFS

Sequence in context: A179075 A175916 A231104 * A188911 A319292 A261834

Adjacent sequences:  A085454 A085455 A085456 * A085458 A085459 A085460

KEYWORD

easy,sign

AUTHOR

Mario Catalani (mario.catalani(AT)unito.it), Jul 01 2003

STATUS

approved

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Last modified October 21 14:18 EDT 2021. Contains 348155 sequences. (Running on oeis4.)