cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A326152 Number of integer partitions of n whose product of parts is 2 * n.

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%I A326152 #8 Jun 10 2019 06:16:36
%S A326152 0,0,0,0,0,0,0,0,3,2,2,0,5,0,2,3,5,0,7,0,5,3,2,0,10,2,2,5,5,0,9,0,9,3,
%T A326152 2,3,14,0,2,3,10,0,9,0,5,9,2,0,17,2,7,3,5,0,14,3,10,3,2,0,19,0,2,9,13,
%U A326152 3,9,0,5,3,9,0,27,0,2,9,5,3,9,0,17,10,2,0
%N A326152 Number of integer partitions of n whose product of parts is 2 * n.
%C A326152 Also the number of orderless factorizations of 2 * n into factors > 1 with sum at most n.
%C A326152 The Heinz numbers of these partitions are given by A326151.
%e A326152 The a(8) = 3 through a(16) = 5 partitions (empty columns not shown) (A = 10):
%e A326152   (44)    (63)    (541)   (831)      (74111)   (A311)      (841111)
%e A326152   (422)   (3321)  (5221)  (6411)     (722111)  (651111)    (8221111)
%e A326152   (2222)                  (62211)              (53211111)  (442111111)
%e A326152                           (432111)                         (4222111111)
%e A326152                           (3222111)                        (22222111111)
%t A326152 Table[Length[Select[IntegerPartitions[n],Times@@#==2*n&]],{n,0,30}]
%Y A326152 Cf. A003963, A057567, A057568, A096276, A114324, A301987, A319005, A326149, A326151, A326156, A326157.
%K A326152 nonn
%O A326152 0,9
%A A326152 _Gus Wiseman_, Jun 09 2019