OFFSET
1,1
COMMENTS
Fourth column of triangular array T defined in A131074.
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,0,0,-1,1).
FORMULA
a(1) = 8, a(2) = a(8) = 7, a(3) = a(7) = 4, a(4) = a(6) = 1, a(5) = 0; for n > 8, a(n) = a(n-8).
G.f.: (8-x-3*x^2-3*x^3+7*x^4)/((1-x)*(1+x^4)).
MATHEMATICA
PadRight[{}, 120, {8, 7, 4, 1, 0, 1, 4, 7}] Harvey P. Dale, May 20 2012
PROG
(PARI) {m=105; for(n=1, m, r=(n-1)%8; print1(if(r==0, 8, if(r==1||r==7, 7, if(r==2||r==6, 4, if(r==4, 0, 1)))), ", "))}
(Magma) m:=105; [ [8, 7, 4, 1, 0, 1, 4, 7][(n-1) mod 8 + 1]: n in [1..m] ];
CROSSREFS
KEYWORD
nonn,easy,less
AUTHOR
Klaus Brockhaus, following a suggestion of Paul Curtz, Jun 14 2007
STATUS
approved