

A120581


Hankel transform of sum{k=0..n, C(2k,k)*2^k}.


0



1, 4, 64, 28672, 17825792, 24696061952, 4398046511104, 6413125869375586304, 1279761316857673852911616, 565738597953418785628899770368, 372547299599873882347063111621541888, 5264848781000759906705331926184317767647232
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OFFSET

0,2


LINKS

Table of n, a(n) for n=0..11.


FORMULA

a(n)=4^(n+C(n,2))(1)^n*sum{k=0..n, C(n+k,2k)(2)^(nk)}; a(n)=8^n*4^C(n,2)*sum{k=0..n, C(n+k,2k)(2)^(k)}; a(n)=4^n*4^C(n,2)(1)^n*A087168(n);


CROSSREFS

Cf. A120580.
Sequence in context: A211214 A229867 A051191 * A146520 A030176 A033635
Adjacent sequences: A120578 A120579 A120580 * A120582 A120583 A120584


KEYWORD

easy,sign


AUTHOR

Paul Barry, Jun 15 2006


STATUS

approved



