OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (8,-24,32,-16).
FORMULA
a(n) = 2^n * A000330(n+1). - R. J. Mathar, Oct 23 2008
From Colin Barker, Feb 13 2017: (Start)
a(n) = 8*a(n-1) - 24*a(n-2) + 32*a(n-3) - 16*a(n-4) for n>3.
a(n) = (2^(n-1)*(6 + 13*n + 9*n^2 + 2*n^3)) / 3. (End)
a(n) = (1/2) * Sum_{k=0..n+1} Sum_{i=0..n+1} (n-i+1)^2 * C(n+1,k). - Wesley Ivan Hurt, Sep 21 2017
PROG
(PARI) Vec((1 + 2*x) / (1 - 2*x)^4 + O(x^30)) \\ Charles R Greathouse IV, Sep 26 2012, corrected by Colin Barker, Feb 13 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Feb 13 2017
STATUS
approved