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!)
A309670 Number of colored compositions of n using all colors of an initial interval of the color palette such that all parts have different color patterns and the patterns for parts i are sorted and have i colors in (weakly) increasing order. 2

%I #40 Mar 05 2022 03:54:53

%S 1,1,3,21,115,813,7627,71173,740023,8544169,107195083,1434581205,

%T 20499413667,312262663989,4992164670007,84221279919193,

%U 1492818584618099,27607818180267269,533522844488072987,10724970103003953053,223859943086157531063,4847766598150865273721

%N Number of colored compositions of n using all colors of an initial interval of the color palette such that all parts have different color patterns and the patterns for parts i are sorted and have i colors in (weakly) increasing order.

%H Alois P. Heinz, <a href="/A309670/b309670.txt">Table of n, a(n) for n = 0..200</a>

%p C:= binomial:

%p b:= proc(n, i, k, p) option remember; `if`(n=0, p!, `if`(i<1, 0, add(

%p b(n-i*j, min(n-i*j, i-1), k, p+j)/j!*C(C(k+i-1, i), j), j=0..n/i)))

%p end:

%p a:= n-> add(add(b(n$2, i, 0)*(-1)^(k-i)*C(k, i), i=0..k), k=0..n):

%p seq(a(n), n=0..23);

%t c = Binomial;

%t b[n_, i_, k_, p_] := b[n, i, k, p] = If[n == 0, p!, If[i<1, 0, Sum[b[n - i*j, Min[n - i*j, i-1], k, p+j]/j!*c[c[k+i-1, i], j], {j, 0, n/i}]]];

%t a[n_] := Sum[Sum[b[n, n, i, 0]*(-1)^(k-i)*c[k, i], {i, 0, k}], {k, 0, n}];

%t Table[a[n], {n, 0, 23}] (* _Jean-François Alcover_, Mar 05 2022, after _Alois P. Heinz_ *)

%Y Row sums of A327244.

%K nonn

%O 0,3

%A _Alois P. Heinz_, Sep 18 2019

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 15 18:29 EDT 2024. Contains 372549 sequences. (Running on oeis4.)