_Henry Bottomley (se16(AT)btinternet.com), _, Apr 05 2000
OEIS Server: https://oeis.org/edit/global/247
a:= := proc(n) option remember; if n<=2 then 1 else a(a(n-3))+a(n-a(n-3)); fi; end;
easy,nonn,new
Cf. A004001, A005229.
Henry Bottomley (se16@(AT)btinternet.com), Apr 05 2000
a(n)=a(a(n-3))+a(n-a(n-3)) if n>2 otherwise a(n)=1.
1, 1, 1, 2, 3, 4, 4, 5, 6, 7, 8, 8, 9, 10, 10, 11, 12, 13, 13, 14, 15, 16, 16, 17, 18, 19, 20, 20, 21, 22, 23, 24, 24, 25, 26, 26, 27, 28, 29, 29, 30, 31, 32, 33, 34, 34, 35, 36, 36, 36, 37, 38, 39, 40, 41, 41, 42, 43, 44, 45, 46, 47, 47, 48
0,4
a(n)<=n-1; apparently a(n-1)<=a(n)<=a(n-1)+1.
a:=proc(n) option remember; if n<=2 then 1 else a(a(n-3))+a(n-a(n-3)); fi; end;
Cf. A004001, A005229
easy,nonn
Henry Bottomley ([email protected]), Apr 05 2000
approved