A060643 - OEIS

A060643

Number of conjugacy classes in the symmetric group S_n that have even number of elements.

0, 0, 1, 3, 5, 7, 11, 20, 28, 38, 52, 73, 97, 127, 168, 229, 295, 381, 486, 623, 788, 994, 1247, 1571, 1954, 2428, 3002, 3710, 4557, 5588, 6826, 8347, 10141, 12306, 14879, 17973, 21633, 26007, 31177, 37334, 44579, 53166, 63253, 75167, 89126, 105542, 124738

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

COMMENTS

The total number of conjugacy classes of S_n is the partition function p(n) (sequence A000041) and the number of conjugacy classes that have odd number of elements is given in A060632 so a(n) = A000041(n) - A060632(n) for n >= 1.

LINKS

Table of n, a(n) for n=1..47.

FORMULA

a(n) = A000041(n) - A060632(n).

CROSSREFS

Cf. A000041, A060632.

Sequence in context: A323065 A225421 A175235 * A025077 A186773 A130759

Adjacent sequences: A060640 A060641 A060642 * A060644 A060645 A060646

KEYWORD

nonn

AUTHOR

Avi Peretz (njk(AT)netvision.net.il), Apr 17 2001

EXTENSIONS

More terms from Sean A. Irvine, Dec 05 2022

STATUS

approved