OFFSET
0,2
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.: (1 + 78*x + 49*x^2)/(1-x)^3. - R. J. Mathar, Mar 21 2016
From G. C. Greubel, Dec 28 2022: (Start)
a(2*n) = A016754(8*n).
E.g.f.: (1 + 80*x + 64*x^2)*exp(x). (End)
Sum_{n>=0} 1/a(n) = psi'(1/8)/64 = 1.02168958507793.. - R. J. Mathar, May 07 2024
MATHEMATICA
(8*Range[0, 40] +1)^2 (* G. C. Greubel, Dec 28 2022 *)
PROG
(Magma) [(8*n+1)^2: n in [0..40]]; // Vincenzo Librandi, Jul 11 2011
(PARI) a(n)=(8*n+1)^2 \\ Charles R Greathouse IV, Jun 17 2017
(SageMath) [(8*n+1)^2 for n in range(41)] # G. C. Greubel, Dec 28 2022
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved