OFFSET
0,4
COMMENTS
The signed version (-1)^(n+1)*n*Pell(n-2) is the second inverse binomial transform of A093967.
LINKS
Index entries for linear recurrences with constant coefficients, signature (4,-2,-4,-1).
FORMULA
G.f.: x(1-4x+5x^2)/(1-2x-x^2)^2;
a(n) = n*(1 + sqrt(2))^n*(3*sqrt(2)/4 - 1) - n*(1 - sqrt(2))^n*(3*sqrt(2)/4 + 1).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 21 2004
STATUS
approved