OFFSET
1,2
COMMENTS
The old definition was: Colorless combinations of quarks and antiquarks of length n >= 1.
REFERENCES
Florentin Smarandache, "Matter, Antimatter and Unmatter", Infinite Energy, Concord, NH, USA, Vol. 11, Issue 62, 50-51, 2005.
LINKS
Florentin Smarandache, A New Form of Matter - Unmatter, Formed by Particles and Anti-Particles", EXT-2004-182 in CERN's web site, 2004.
Index entries for linear recurrences with constant coefficients, signature (6,0,216,-1296).
FORMULA
a(n) = ( n - 1 - 2*floor((n-1)/3) )*6^n.
MATHEMATICA
Table[(n - 1 - 2 Floor[(n - 1)/3]) 6^n, {n, 1, 30}]
LinearRecurrence[{6, 0, 216, -1296}, {0, 36, 432, 1296}, 30] (* Harvey P. Dale, Jul 04 2019 *)
PROG
(PARI) concat(0, 36*Vec(x*(1+6*x-36*x^2) / (1-6*x)^2 / (1+6*x+36*x^2)+O(x^99)))
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Florentin Smarandache (smarand(AT)unm.edu), Nov 04 2010
EXTENSIONS
Entry revised by Editors of the OEIS, Sep 11 2014
STATUS
approved