login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A335713 The sum of the sizes of the largest fixed points over all compositions of n. 3

%I #16 Mar 03 2021 21:51:04

%S 1,1,3,7,16,34,73,155,324,674,1393,2861,5852,11929,24239,49127,99360,

%T 200598,404377,814135,1637363,3290067,6605980,13255451,26583994,

%U 53290694,106787166,213919062,428415074,857794856,1717201360,3437092882,6878672565,13764822699

%N The sum of the sizes of the largest fixed points over all compositions of n.

%D M. Archibald, A. Blecher and A. Knopfmacher, Fixed points in compositions and words, accepted by the Journal of Integer Sequences.

%H Alois P. Heinz, <a href="/A335713/b335713.txt">Table of n, a(n) for n = 1..500</a>

%H M. Archibald, A. Blecher, and A. Knopfmacher, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL23/Blecher/arch14.html">Fixed Points in Compositions and Words</a>, J. Int. Seq., Vol. 23 (2020), Article 20.11.1.

%F G.f.: Sum_{j>=1} (x/(1-x))^(j-1) j x^j Sum_{k>=j} Product_{i=j+1..k} (x/(1-x) - x^i).

%e For n=3 the a(3)=3 values are the first 1 in the composition 111 and the 2 in the composition 12 (the compositions 21 and 3 do not have any fixed points).

%Y Cf. A099036, A335712, A335714.

%K nonn

%O 1,3

%A _Margaret Archibald_, Jun 18 2020

%E a(21)-a(34) from _Alois P. Heinz_, Jun 18 2020

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 23 07:57 EDT 2024. Contains 371905 sequences. (Running on oeis4.)