OFFSET
0,1
LINKS
T. D. Noe, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).
FORMULA
From Jaume Oliver Lafont, Oct 20 2009: (Start)
G.f.: 3*(1+x)*(5+206*x+5*x^2)/(1-x)^4.
Sum_{k>=0} 1/a(k) = log(3)/16. (End)
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) for n >= 4. - Jinyuan Wang, Mar 10 2020
Sum_{n>=0} (-1)^n/a(n) = Pi/48. - Amiram Eldar, Sep 22 2022
MAPLE
MATHEMATICA
Table[(6n+1)(6n+3)(6n+5), {n, 0, 50}] (* Wesley Ivan Hurt, Mar 10 2014 *)
PROG
(PARI) a(n)=(6*n+1)*(6*n+3)*(6*n+5) \\ Charles R Greathouse IV, Oct 18 2022
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved