A152668 - cp's OEIS frontend

A152668 Number of runs of even entries in all permutations of {1,2,...,n} (the permutation 274831659 has 3 runs of even entries: 2, 48 and 6).

n	a(n)
2	2
3	6
4	36
5	192
6	1440
7	10800
8	100800
9	967680
10	10886400
11	127008000
12	1676505600
13	22992076800
14	348713164800
15	5492232345600
16	94152554496000
17	1673823191040000
18	32011868528640000
19	633834996867072000
20	13380961044971520000

[2, 6, 36, 192, 1440, 10800, 100800, 967680, 10886400, 127008000, 1676505600, 22992076800, 348713164800, 5492232345600, 94152554496000, 1673823191040000, 32011868528640000, 633834996867072000, 13380961044971520000]

cp's OEIS Frontend

A152668 Number of runs of even entries in all permutations of {1,2,...,n} (the permutation 274831659 has 3 runs of even entries: 2, 48 and 6).

Table of values

List of values