

A246074


Paradigm Shift Sequence for a (4,5) production scheme with replacement.


18



1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 28, 32, 36, 40, 44, 48, 56, 64, 72, 80, 88, 96, 112, 128, 144, 160, 176, 192, 224, 256, 288, 320, 352, 384, 448, 512, 576, 640, 704, 768, 896, 1024, 1152, 1280, 1408, 1536, 1792, 2048, 2304, 2560, 2816, 3072, 3584, 4096, 4608, 5120, 5632, 6144, 7168, 8192, 9216
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OFFSET

1,2


COMMENTS

This sequence is the solution to the following problem: "Suppose you have the choice of using one of three production options: apply a simple incremental action, bundle existing output as an integrated product (which requires p=4 steps), or implement the current bundled action (which requires q=5 steps). The first use of a novel bundle erases (or makes obsolete) all prior actions. How large an output can be generated in n time steps?"
1. A production scheme with replacement R(p,q) eliminates existing output followinging a bundling action, while an additive scheme A(p,q) retains the output. The schemes correspond according to A(p,q)=R(pq,q), with the replacement scheme serving as the default presentation.
2. This problem is structurally similar to the Copy and Paste Keyboard problem: Existing sequences (A178715 and A193286) should be regarded as ParadigmShift Sequences with production schemes R(1,1) and R(2,1) with replacement, respectively.
3. The ideal number of implementations per bundle, as measured by the geometric growth rate (p+zq root of z), is z = 2.
4. All solutions will be of the form a(n) = (qm+r) * m^b * (m+1)^d.
5. The paradigm shift sequence for the R(4,5) scheme is also the solution to the R(2,4) scheme.


LINKS

Colin Barker, Table of n, a(n) for n = 1..1000
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,2).


FORMULA

a(n) = (qd+r) * d^(CR) * (d+1)^R, where r = (nCp) mod q, Q = floor( (RCp)/q ), R = Q mod (C+1), and d = floor ( Q/(C+1) ).
a(n) = 2*a(n6) for all n >= 12.
G.f.: x*(1+x)^2 * (1x+x^2)^2 * (1+x+x^2)^2 / (12*x^6).  Colin Barker, Nov 18 2016


MATHEMATICA

Join[{1, 2, 3, 4, 5}, LinearRecurrence[{0, 0, 0, 0, 0, 2}, {6, 7, 8, 9, 10, 11}, 64]] (* JeanFrançois Alcover, Sep 25 2017 *)


PROG

(PARI) Vec(x*(1+x)^2 * (1x+x^2)^2 * (1+x+x^2)^2 / (12*x^6) + O(x^100)) \\ Colin Barker, Nov 18 2016


CROSSREFS

Paradigm shift sequences with implementation step q=5: A103969, A246074, A246075, A246076, A246079, A246083, A246087, A246091, A246095, A246099, A246103.
Paradigm shift sequences with negative bundling steps: A103969, A246074, A246075, A246076, A246079, A029750, A246078, A029747, A246077, A029744, A029747, A131577.
Sequence in context: A221912 A008730 A033064 * A130225 A096902 A246081
Adjacent sequences: A246071 A246072 A246073 * A246075 A246076 A246077


KEYWORD

nonn,easy


AUTHOR

Jonathan T. Rowell, Aug 13 2014


STATUS

approved



