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1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1, 3, 9, 11, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=(1/2)*{7*(n mod 4)+[(n+1) mod 4]-[(n+2) mod 4]+[(n+3) mod 4]}, with n>=0. a(n)=6-(2-2*I)*I^n-(-1)^n-(2+2*I)*(-I)^n, with n>=0 and I=sqrt(-1). [From Paolo P. Lava (paoloplava(AT)gmail.com), Feb 25 2010]
a(n) = a(n-4). G.f.: (1+3*x+9*x^2+11*x^3)/ ((1-x) * (1+x) * (1+x^2)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 13 2010]
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PROG
| (Other) sage: [power_mod(3, n, 16)for n in xrange(0, 93)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 25 2009]
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CROSSREFS
| Sequence in context: A173242 A121057 A025538 * A174565 A074261 A059868
Adjacent sequences: A070351 A070352 A070353 * A070355 A070356 A070357
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 12 2002
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