OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..10000
Index entries for linear recurrences with constant coefficients, signature (3,-3,1).
FORMULA
G.f.: -4*(1 + 22*x + 9*x^2)/(x-1)^3. - R. J. Mathar, Jul 14 2016
From Amiram Eldar, Apr 24 2023: (Start)
a(n) = A017089(n)^2.
a(n) = 2^2*A016814(n).
Sum_{n>=0} 1/a(n) = Pi^2/64 + G/8, where G is Catalan's constant (A006752). (End)
MATHEMATICA
Table[(8*n + 2)^2, {n, 0, 40}] (* Amiram Eldar, Apr 24 2023 *)
PROG
(Magma) [(8*n+2)^2: n in [0..35]]; // Vincenzo Librandi, Jul 12 2011
(PARI) a(n)=(8*n+2)^2 \\ Charles R Greathouse IV, Jun 17 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved