login
A076119
Every second sector of a dartboard, starting at the top (20) and working around clockwise.
2
20, 18, 13, 10, 2, 3, 7, 8, 14, 12, 20, 18, 13, 10, 2, 3, 7, 8, 14, 12, 20, 18, 13, 10, 2, 3, 7, 8, 14, 12, 20, 18, 13, 10, 2, 3, 7, 8, 14, 12, 20, 18, 13, 10, 2, 3, 7, 8, 14, 12, 20, 18, 13, 10, 2, 3, 7, 8, 14, 12, 20, 18, 13, 10, 2, 3, 7, 8, 14, 12, 20, 18, 13, 10, 2
OFFSET
1,1
COMMENTS
Period 10: repeat [20,18,13,10,2,3,7,8,14,12]. - Wesley Ivan Hurt, Jul 15 2015
FORMULA
G.f.: x*(20+18*x+13*x^2+10*x^3+2*x^4+3*x^5+7*x^6+8*x^7+14*x^8+12*x^9) / (1-x^10). a(n) = a(n-10), n>10. - Wesley Ivan Hurt, Jul 15 2015
MAPLE
A076119:=n->[20, 18, 13, 10, 2, 3, 7, 8, 14, 12][(n mod 10)+1]: seq(A076119(n), n=0..100); # Wesley Ivan Hurt, Jul 15 2015
MATHEMATICA
CoefficientList[Series[(20 + 18 x + 13 x^2 + 10 x^3 + 2 x^4 + 3 x^5 + 7 x^6 + 8 x^7 + 14 x^8 + 12 x^9)/(1 - x^10), {x, 0, 100}], x] (* Wesley Ivan Hurt, Jul 15 2015 *)
PROG
(Magma) R:=[20, 18, 13, 10, 2, 3, 7, 8, 14, 12]; [n le 10 select R[n] else Self(n-10): n in [1..100]]; // Wesley Ivan Hurt, Jul 15 2015
(Magma) &cat [[20, 18, 13, 10, 2, 3, 7, 8, 14, 12]: n in [1..7]]; // Vincenzo Librandi, Jul 16 2015
(PARI) a(n)=[12, 20, 18, 13, 10, 2, 3, 7, 8, 14][n%10+1] \\ Charles R Greathouse IV, Aug 20 2015
CROSSREFS
Cf. A003833.
Sequence in context: A327788 A376974 A365065 * A004509 A248942 A022976
KEYWORD
nonn,easy
AUTHOR
Darren Izzard (zysyshelp(AT)yahoo.com), Oct 31 2002
STATUS
approved