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!)
A259899 a(n) is the minimal position at which the maximal value of row n appears in row n of triangle A080936. 4

%I #44 Dec 21 2015 01:52:36

%S 1,1,2,2,3,3,3,4,4,4,4,4,5,5,5,5,6,6,6,6,6,6,7,7,7,7,7,7,8,8,8,8,8,8,

%T 8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,

%U 11,12,12,12,12,12,12,12,12,12,12,13,13,13,13

%N a(n) is the minimal position at which the maximal value of row n appears in row n of triangle A080936.

%C Empirical: for n>2 there is a unique position at which the maximum of row n occurs.

%C Conjecture: a(n) = floor(sqrt(p*n+q)+r) for all n>=1, where p = 2.67996... = A265179^2 and q,r are some constants (best values found: q=3.6, r=-1).

%H Gheorghe Coserea, <a href="/A259899/b259899.txt">Table of n, a(n) for n = 1..1535</a>

%F a(n) = min argmax(k->T(n,k), k=1..n), that is a(n) = min{k, T(n,k) = max{T(n,p), p=1..n}}, where T(n,k) is the number of Dyck paths of length 2n and height k, 1 <= k <= n.

%F a(n) ~ K * sqrt(n), where K = 1.63706... (see A265179). - _Gheorghe Coserea_, Dec 05 2015

%e For n=2, a(2)=1 because max{T(2,p), p=1..2}=1 and T(2,1)=1.

%e For n=4, a(4)=2 because max{T(4,p), p=1..4}=7 and T(4,2)=7.

%e For n=16, a(16)=5 because max{T(16,p), p=1..16}=9246276 and T(16,5)=9246276.

%Y Cf. A080936, A259885 (value of maximum), A265179.

%K nonn,walk

%O 1,3

%A _Gheorghe Coserea_, Jul 07 2015

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 16 19:21 EDT 2024. Contains 371754 sequences. (Running on oeis4.)