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A060368 Number of irreducible representations of the symmetric group S_n that have even degree. 2

%I #5 Dec 07 2019 12:18:22

%S 0,0,1,1,3,3,7,14,22,26,40,45,69,71,112,215,281,353,458,563,728,874,

%T 1127,1447,1830,2180,2754,3206,4053,4580,5818,8317,10111,12246,14819,

%U 17849,21509,25759,30929,37082,44327,52662,62749,74151,88110,103510,122706

%N Number of irreducible representations of the symmetric group S_n that have even degree.

%H Eric M. Schmidt, <a href="/A060368/b060368.txt">Table of n, a(n) for n = 1..1000</a>

%F The total number of irreducible representations of S_n is the partition function p(n) (sequence A000041) and the number of irreducible representations of the symmetric group S_n that have odd degree is given in A059867 so a(n) = A000041(n) - A059867(n) for n >= 1

%e a(3) = 1 because the degrees of the irreducible representations of S_3 are 1,1,2.

%o (Sage) def A060368(n) : dig = n.digits(2); return Partitions(n).cardinality() - prod(2^n for n in range(len(dig)) if dig[n]==1) # _Eric M. Schmidt_, Apr 29 2013

%Y A059867, A000041.

%K nonn

%O 1,5

%A Avi Peretz (njk(AT)netvision.net.il), Apr 01 2001

%E More terms from _Eric M. Schmidt_, Apr 29 2013

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Last modified July 29 20:04 EDT 2024. Contains 374734 sequences. (Running on oeis4.)