OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..2000
Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).
FORMULA
From Amiram Eldar, Mar 30 2022: (Start)
a(n) = 3^6*A016758(n).
Sum_{n>=0} 1/a(n) = Pi^6/699840. (End)
MATHEMATICA
(3 + 6Range[0, 20])^6 (* Harvey P. Dale, Jan 31 2011 *)
PROG
(Magma) [(6*n+3)^6: n in [0..40]]; // Vincenzo Librandi, May 05 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved