login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A246234 Number of compositions of n into exactly seven different parts with distinct multiplicities. 2
2431106898187968000, 25830510793247160000, 121150160426367072000, 478913588068635720000, 1848522650426852400000, 6067325851827648408000, 19158973516499432616000, 59882095876893754464000, 173801554657753702680000, 487295849448575903736000 (list; graph; refs; listen; history; text; internal format)
OFFSET

84,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 84..120

MATHEMATICA

$RecursionLimit = 1000; b[n_, i_, s_List] := b[n, i, s] = If[n == 0, Total[s]!, If[i < 1, 0, Expand[ Sum[ If[j > 0 && MemberQ[s, j], 0, If[j == 0, 1, x]*b[n - i*j, i - 1, If[j == 0, s, s ~Union~ {j}]]/j!], {j, 0, n/i}]]]]; a[n_] := Coefficient[b[n, n, {}], x, 7]; Table[a[n], {n, 84, 100}] (* Jean-Fran├žois Alcover, Feb 11 2015, after Alois P. Heinz *)

CROSSREFS

Column k=7 of A242896.

Sequence in context: A115539 A080129 A272519 * A274814 A323534 A324207

Adjacent sequences:  A246231 A246232 A246233 * A246235 A246236 A246237

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Aug 19 2014

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 4 15:43 EDT 2020. Contains 335448 sequences. (Running on oeis4.)