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A063892
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a(1) = a(2) = a(3) = 1, a(n) = a(n-a(n-2))+a(n-a(n-3)) for n>3.
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6
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1, 1, 1, 2, 4, 6, 5, 3, 3, 9, 6, 4, 7, 12, 9, 5, 7, 10, 16, 16, 10, 12, 12, 16, 14, 21, 13, 17, 8, 14, 24, 26, 19, 12, 8, 23, 22, 23, 12, 17, 18, 28, 35, 26, 16, 22, 34, 47, 22, 6, 10, 36, 69, 36
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OFFSET
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1,4
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COMMENTS
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Undefined for n>54 since a(53)=69>=55.
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LINKS
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EXAMPLE
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a(7) = a(7-a(5))+a(7-a(4)) = a(7-4)+a(7-2) = a(3)+a(5) = 1+4 = 5.
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MAPLE
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#Q(r, s) with initial values 1, 1, 1, ..., from N. J. A. Sloane, Apr 15 2014
r:=2; s:=3;
a:=proc(n) option remember; global r, s;
if n <= s then 1
else
if (a(n-r) <= n) and (a(n-s) <= n) then
a(n-a(n-r))+a(n-a(n-s));
else lprint("died with n =", n); return (-1);
fi;
fi; end;
[seq(a(n), n=1..54)];
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CROSSREFS
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See A064714 for a variant which does not die.
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KEYWORD
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fini,full,nonn
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AUTHOR
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STATUS
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approved
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