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A361223

Maximum number of inequivalent permutations of a partition of n, where two permutations are equivalent if they are reversals of each other.

1, 1, 1, 2, 2, 4, 6, 10, 16, 30, 54, 84, 140, 252, 420, 756, 1260, 2520, 4620, 7920, 13860, 27720, 51480, 90120, 180180, 337890, 600600, 1081080, 2042040, 3675672, 6348888, 12252240, 23279256, 42325920, 77597520, 148140720, 271591320, 480507720, 892371480

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

OFFSET

1,4

LINKS

Pontus von Brömssen, Table of n, a(n) for n = 1..100

EXAMPLE

For n = 5, the 7 partitions have the following permutations (~ means equivalence under reversal):

permutations | number of inequivalent permutations

---------------------+------------------------------------

5 | 1

41~14 | 1

32~23 | 1