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A131079
Periodic sequence (2, 2, 2, 1, 0, 0, 0, 1).
5
2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2
OFFSET
1,1
COMMENTS
Second column of triangular array T defined in A131074.
FORMULA
a(n) = a(n-8).
G.f.: x*(2-x^3+x^4)/((1-x)*(1+x^4)).
MATHEMATICA
PadRight[{}, 120, {2, 2, 2, 1, 0, 0, 0, 1}] (* Harvey P. Dale, Mar 04 2020 *)
PROG
(PARI) {m=105; for(n=1, m, r=(n-1)%8; print1(if(r<3, 2, if(r==3||r==7, 1, 0)), ", "))}
(Magma) m:=105; [ [2, 2, 2, 1, 0, 0, 0, 1][(n-1) mod 8 + 1]: n in [1..m] ];
CROSSREFS
Sequence in context: A181230 A262372 A292520 * A334889 A078336 A076441
KEYWORD
nonn,easy,less
AUTHOR
Klaus Brockhaus, following a suggestion of Paul Curtz, Jun 14 2007
STATUS
approved