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 A146761 Period 6: repeat [0, 0, 6, 6, 3, 3]. 1
 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6, 6, 3, 3, 0, 0, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Equals A002798 mod 9. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (1,-1,1,-1,1). FORMULA a(n) = (1/10)*{7*(n mod 6)+2*[(n+1) mod 6]+7*[(n+2) mod 6]+2*[(n+3) mod 6]-8*[(n+4) mod 6]+2*[(n+5) mod 6]}, with n>=0. [Paolo P. Lava, Nov 06 2008] From Richard Choulet, Dec 02 2008: (Start) a(n+6) = a(n) with a(0)=a(1)=0, a(2)=a(3)=6, a(4)=a(5)=3. O.g.f: f(z)=a(0)+a(1)*z+...=((6*z^2+3*z^4)/((1-z)*(1+z+z^2)*(1-z+z^2))). a(n) = 3-sqrt(3)*sin(2*Pi*n/3)-3*cos(Pi*n/3). (End) a(n) = a(n-1) - a(n-2) + a(n-3) - a(n-4) + a(n-5) for n>4. - Wesley Ivan Hurt, Jun 18 2016 MAPLE A146761:=n->[0, 0, 6, 6, 3, 3][(n mod 6)+1]: seq(A146761(n), n=0..100); # Wesley Ivan Hurt, Jun 18 2016 MATHEMATICA PadRight[{}, 108, {0, 0, 6, 6, 3, 3}] (* Harvey P. Dale, May 01 2012 *) PROG (MAGMA) &cat[[0, 0, 6, 6, 3, 3]^^20]; // Wesley Ivan Hurt, Jun 18 2016 CROSSREFS Cf. A002798. Sequence in context: A154006 A143080 A011484 * A010498 A339083 A240502 Adjacent sequences:  A146758 A146759 A146760 * A146762 A146763 A146764 KEYWORD nonn,easy AUTHOR Paul Curtz, Nov 02 2008 STATUS approved

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Last modified December 5 12:24 EST 2021. Contains 349557 sequences. (Running on oeis4.)