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A131083
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Periodic sequence (26, 16, 6, 2, 6, 16, 26, 30).
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5
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26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Sixth column of triangular array T defined in A131074.
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LINKS
| Index entries for sequences related to linear recurrences with constant coefficients, signature (1,0,0,-1,1).
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FORMULA
| a(1) = a(7) = 26, a(2) = a(6) = 16, a(3) = a(5) = 6, a(4) = 2, a(8) = 30; for n > 8, a(n) = a(n-8).
G.f.: (26-10*x-10*x^2-4*x^3+30*x^4)/((1-x)*(1+x^4))
a(n)=(1/28)*{30*(n mod 8)+2*[(n+1) mod 8]-19*[(n+2) mod 8]-19*[(n+3) mod 8]+2*[(n+4) mod 8]+30*[(n+5) mod 8]+51*[(n+6) mod 8]+51*[(n+7) mod 8]}, with n>=0. - Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Jun 19 2007
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PROG
| (PARI) {m=80; for(n=1, m, r=(n-1)%8; print1(if(r==0||r==6, 26, if(r==1||r==5, 16, if(r==2||r==4, 6, if(r==3, 2, 30)))), ", "))}
(MAGMA) m:=80; [ [26, 16, 6, 2, 6, 16, 26, 30][(n-1) mod 8 + 1]: n in [1..m] ];
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CROSSREFS
| Cf. A131074, A131030.
Sequence in context: A036168 A005606 A064267 * A203597 A040652 A154295
Adjacent sequences: A131080 A131081 A131082 * A131084 A131085 A131086
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KEYWORD
| nonn,easy,less
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AUTHOR
| Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), following a suggestion of Paul Curtz (bpcrtz(AT)free.fr), Jun 14 2007
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