The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A097306 Array of number of partitions of n with odd parts not exceeding 2*m-1 with m in {1, 2, ..., ceiling(n/2)}. 4

%I #15 Aug 29 2019 16:15:06

%S 1,1,1,2,1,2,1,2,3,1,3,4,1,3,4,5,1,3,5,6,1,4,6,7,8,1,4,7,9,10,1,4,8,

%T 10,11,12,1,5,9,12,14,15,1,5,10,14,16,17,18,1,5,11,16,19,21,22,1,6,13,

%U 19,23,25,26,27,1,6,14,21,26,29,31,32,1,6,15,24,30,34,36,37,38,1,7,17,27

%N Array of number of partitions of n with odd parts not exceeding 2*m-1 with m in {1, 2, ..., ceiling(n/2)}.

%C The sequence of row lengths of this array is A008619 = [1,1,2,2,3,3,4,4,5,5,6,6,7,7,...].

%C This is the partial row sums array of array A097305.

%C The number of partitions of N=2*n (n >= 1) into even parts not exceeding 2*k, with k from {1,...,n}, is given by the triangle A026820(n,k).

%H Wolfdieter Lang, <a href="/A097306/a097306_1.txt">First 18 rows.</a>

%F T(n, m) = number of partitions of n with odd parts only and largest parts <= 2*m-1 for m from {1, 2, ..., ceiling(n/2)}.

%F T(n, m) = Sum_{k=1..m} A097305(n, k), m = 1..ceiling(n/2), n >= 1.

%e [1]; [1]; [1,2]; [1,2]; [1,2,3]; [1,3,4]; [1,3,4,5]; [1,3,5,6]; ...

%e T(8,2)=3 because there are three partitions of 8 with odd parts not exceeding 3, namely (1^8), (1^5,3) and (1^2,3^2).

%e T(6,2)=3 from the partitions (1^6), (1^3,3) and (3^2).

%p Sequence of row numbers for n>=1: [seq(coeff(series(product(1/(1-x^(2*k-1)),k=1..p),x,n+1),x,n),p=1..ceil(n/2))].

%Y Row sums: A097307.

%K nonn,tabf,easy

%O 1,4

%A _Wolfdieter Lang_, Aug 13 2004

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 May 14 17:50 EDT 2024. Contains 372533 sequences. (Running on oeis4.)