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A158459
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Period 4: Repeat (0,3,2,1); a(n)=4-n (mod 4).
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2
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0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| A102370(n) modulo 4.
a(n)=1.5-0.5*(-1)^n+sin(n*Pi/2)-cos(n*Pi/2) [From Richard Choulet (richardchoulet(AT)yahoo.fr), Apr 07 2009]
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (0,0,0,1).
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FORMULA
| G.f. : x(x^2+2x+3)/(1-x^4) .
a(n)=(1/2)*{(n mod 4)+[(n+1) mod 4]+[(n+2) mod 4]-[(n+3) mod 4]}, with n>=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Mar 30 2009]
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PROG
| (PARI) A158459(n)=(-n)%4 \\ - M. F. Hasler, Jan 13 2012
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CROSSREFS
| Sequence in context: A068494 A195040 A083721 * A031251 A194885 A128317
Adjacent sequences: A158456 A158457 A158458 * A158460 A158461 A158462
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KEYWORD
| nonn,easy
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AUTHOR
| Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Mar 19 2009
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EXTENSIONS
| Better definition from M. F. Hasler, Jan 13 2012
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