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A131080
Periodic sequence (4, 4, 3, 1, 0, 0, 1, 3).
5
4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4, 4, 3, 1, 0, 0, 1, 3, 4
OFFSET
1,1
COMMENTS
Third column of triangular array T defined in A131074.
FORMULA
a(n) = a(n-8).
G.f.: x*(4-x^2-2*x^3+3*x^4)/((1-x)*(1+x^4)).
PROG
(PARI) {m=105; for(n=1, m, r=(n-1)%8; print1(if(r<2, 4, if(r==2||r==7, 3, if(r==3||r==6, 1, 0))), ", "))}
(Magma) m:=105; [ [4, 4, 3, 1, 0, 0, 1, 3][(n-1) mod 8 + 1]: n in [1..m] ];
CROSSREFS
Sequence in context: A340193 A340196 A016707 * A010657 A019706 A016497
KEYWORD
nonn,easy,less
AUTHOR
Klaus Brockhaus, following a suggestion of Paul Curtz, Jun 14 2007
STATUS
approved