OFFSET
0,1
LINKS
Ivan Panchenko, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).
FORMULA
G.f.: ( 27+235*x+121*x^2+x^3 ) / (x-1)^4 . - R. J. Mathar, Dec 03 2015
Sum_{n>=0} 1/a(n) = 7*zeta(3)/16 - Pi^3/64. - Amiram Eldar, Jun 28 2020
MATHEMATICA
(4*Range[0, 30]+3)^3 (* or *) LinearRecurrence[{4, -6, 4, -1}, {27, 343, 1331, 3375}, 30] (* Harvey P. Dale, Jul 21 2018 *)
PROG
(PARI) a(n) = (4*n+3)^3; \\ Altug Alkan, Dec 03 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved