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%I #12 Aug 12 2020 16:40:41
%S 1,1,4,2,3,3,2,4,1,5,0,6,1,5,2,4,3,3,4,2,5,1,6,0,7,1,6,2,5,3,4,4,3,5,
%T 2,6,1,7,0,8,1,7,2,6,3,5,4,4,5,3,6,2,7,1,8,0,9,1,8,2,7,3,6,4,5,5,4,6,
%U 3,7,2,8,1,9,0,10,1,9,2,8,3,7,4,6,5,5,6,4,7,3,8,2,9,1,10,0,11,1,10,2,9,3,8
%N a(1)=a(2)=1, a(3)=4, a(n)=abs(a(n-1)-a(n-2)-a(n-3)).
%H Reinhard Zumkeller, <a href="/A079623/b079623.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n*(n-10))=0; Max( a(k) : 1<=k<=n) = floor(sqrt(n+24))
%t nxt[{a_,b_,c_}]:={b,c,Abs[c-b-a]}; NestList[nxt,{1,1,4},110][[All,1]] (* _Harvey P. Dale_, Aug 12 2020 *)
%o (Haskell)
%o a079623 n = a079623_list !! (n-1)
%o a079623_list = 1 : 1 : 4 : zipWith3 (\u v w -> abs (w - v - u))
%o a079623_list (tail a079623_list) (drop 2 a079623_list)
%o -- _Reinhard Zumkeller_, Oct 11 2014
%Y Cf. A078108, A080096.
%Y Cf. A077623, A077653, A079624, A088226.
%K nonn
%O 1,3
%A _Benoit Cloitre_, Jan 30 2003
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