OFFSET
0,2
LINKS
Robert Israel, Table of n, a(n) for n = 0..6608
Index entries for linear recurrences with constant coefficients, signature (0,4,0,-4).
FORMULA
G.f.: (1+6*x+6*x^2+4*x^3)/(1-2*x^2)^2. - Robert Israel, Feb 28 2017
MAPLE
seq(seq((4*k+2*j+1)*2^(k+j), j=[0, 1]), k=0..50); # Robert Israel, Feb 28 2017
MATHEMATICA
LinearRecurrence[{0, 4, 0, -4}, {1, 6, 10, 28}, 40] (* Harvey P. Dale, Sep 08 2021 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 21 2004
STATUS
approved