|
|
A182724
|
|
Sum of all parts of all partitions of n minus the number of partitions of n.
|
|
2
|
|
|
0, 2, 6, 15, 28, 55, 90, 154, 240, 378, 560, 847, 1212, 1755, 2464, 3465, 4752, 6545, 8820, 11913, 15840, 21042, 27610, 36225, 46992, 60900, 78260, 100386, 127820, 162516, 205260, 258819, 324576, 406230, 506022, 629195, 778932, 962555, 1185030
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
a(n) is the sum of (the zeroth moments of) all partitions of n minus the partition number of n.
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
a(7) = 90 = (7-1)*15 = 105 - 15, because the number of partitions of 7 is 15 and the sum of all parts of all partitions of 7 is 7*15 = 105.
|
|
MAPLE
|
a:= n-> (n-1) *combinat[numbpart](n):
seq (a(n), n =1..50);
|
|
MATHEMATICA
|
pnxt[n_]:=Module[{ps=IntegerPartitions[n]}, Total[Flatten[ps]]- Length[ps]]; Array[pnxt, 40] (* Harvey P. Dale, Jul 15 2011 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|