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 A245922 First differences of A245921. 4

%I

%S 2,3,2,8,5,8,8,5,13,21,21,13,21,13,21,21,13,21,21,13,21,34,21,34,34,

%T 21,34,21,34,34,21,34,21,34,34,21,34,34,21,34,21,34,34,55,34,55,55,34,

%U 55,55,34,55,34,55,55,34,55,55,34,55,34,55,55,34,55,34,55

%N First differences of A245921.

%C See Comments at A245921. It appears that every term is a Fibonacci number (A000045).

%e (See A245921.)

%t z = 100; seqPosition2[list_, seqtofind_] := Last[Last[Position[Partition[list, Length[#], 1], Flatten[{___, #, ___}], 1, 2]]] &[seqtofind] (*finds the position of the SECOND appearance of seqtofind. Example: seqPosition2[{1,2,3,4,2,3},{2}] = 5*)

%t A014675 = Nest[Flatten[# /. {1 -> 2, 2 -> {2, 1}}] &, {1}, 25]; ans = Join[{A014675[[p[0] = pos = seqPosition2[A014675, #] - 1]]}, #] &[{A014675[[1]]}];

%t cfs = Table[A014675 = Drop[A014675, pos - 1]; ans = Join[{A014675[[p[n] = pos = seqPosition2[A014675, #] - 1]]}, #] &[ans], {n, z}];

%t q = -1+Accumulate[Join[{1}, Table[p[n], {n, 0, z}]]] (* A245921 *)

%t q1 = Differences[q] (* A245922 *)

%Y Cf. A245920, A245921.

%K nonn

%O 1,1

%A _Clark Kimberling_ and _Peter J. C. Moses_, Aug 07 2014

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Last modified September 26 20:34 EDT 2021. Contains 347672 sequences. (Running on oeis4.)