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a(n) = a(a(n-5))+a(n-a(n-5)) if n>2 otherwise a(n)=1.
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%I #9 Apr 05 2015 13:57:45

%S 1,1,1,1,1,2,3,4,5,6,6,7,8,9,10,11,12,12,13,14,15,16,16,17,18,18,19,

%T 20,21,22,23,24,24,25,26,26,27,28,29,30,31,32,33,34,34,35,36,36,37,38,

%U 39,40,41,42,43,44,45,46,46,47,48,48,49,49,50,51,52

%N a(n) = a(a(n-5))+a(n-a(n-5)) if n>2 otherwise a(n)=1.

%p a := proc(n) option remember; if n<=2 then 1 else a(a(n-5))+a(n-a(n-5)); fi; end;

%Y Cf. A004001, A005229.

%K easy,nonn

%O -2,6

%A _Henry Bottomley_, Apr 05 2000