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.: -(25 + 69*x + 4*x^2)/(x-1)^3. - R. J. Mathar, Jul 14 2016
Sum_{n>=0} 1/a(n) = psi'(5/7)/49 = 0.05601413956.. - R. J. Mathar, May 07 2024
E.g.f.: exp(x)*(25 + 119*x + 49*x^2). - Stefano Spezia, Aug 25 2024
MATHEMATICA
(7*Range[0, 50] + 5)^2 (* Paolo Xausa, Aug 22 2024 *)
PROG
(Magma) [(7*n+5)^2: n in [0..40] ]; // Vincenzo Librandi, Jul 18 2011
(PARI) a(n)=(7*n+5)^2 \\ Charles R Greathouse IV, Feb 13 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved