OFFSET
0,3
COMMENTS
A factor in A128056.
The signed sequence 1,1,2,-4,-8,-32,-64,-64,-128,256,512... is the Hankel transform of the doubled sequence 1,1,2,2,6,6,... of central binomial coefficients (A128014). - Paul Barry, Sep 09 2008
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,-4,8,-16,32).
FORMULA
G.f.: (-1-16*x^4+4*x^3-4*x^2+x)/((2*x-1)*(4*x^2-2*x+1)*(4*x^2+2*x+1)). - Maksym Voznyy (voznyy(AT)mail.ru), Aug 11 2009
Sum_{n>=0} 1/a(n) = 62/21. - Amiram Eldar, Mar 28 2023
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Feb 13 2007
STATUS
approved