OFFSET
0,2
COMMENTS
Diagonal of rational function 1/(1 - (x^3 + y^3 + z^3 + 3*x*y*z)). - Gheorghe Coserea, Aug 04 2018
LINKS
Robert Israel, Table of n, a(n) for n = 0..1288
FORMULA
Let H(m, n, x) = m^n*hypergeom([(k-n)/m for k=0..m-1], [1 for k=0..m-2], x) then a(n) = H(3, n, -1).
a(n) ~ sqrt(3) * 6^n / (Pi*n) . - Vaclav Kotesovec, Nov 02 2017
-(54*(n+2))*(n+1)*a(n)+27*(n+2)^2*a(n+1)-(3*(3*n^2+15*n+19))*a(n+2)+(n+3)^2*a(n+3) = 0. - Robert Israel, Nov 02 2017
MAPLE
T := (m, n, x) -> m^n*hypergeom([seq((k-n)/m, k=0..m-1)], [seq(1, k=0..m-2)], x):
seq(simplify(T(3, n, -1)), n=0..39);
MATHEMATICA
Table[3^n * HypergeometricPFQ[{-n/3, (1 - n)/3, (2 - n)/3}, {1, 1}, -1], {n, 0, 30}] (* Vaclav Kotesovec, Nov 02 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, Nov 02 2017
STATUS
approved