A059204 - cp's OEIS frontend

A059204 Number of non-unimodal permutations of n items (i.e., those which do not simply go up for the first part and then down for the rest, but at some point go down then up).

n	a(n)
0	0
1	0
2	0
3	2
4	16
5	104
6	688
7	4976
8	40192
9	362624
10	3628288
11	39915776
12	478999552
13	6227016704
14	87178283008
15	1307674351616
16	20922789855232
17	355687428030464
18	6402373705596928
19	121645100408569856
20	2432902008176115712
21	51090942171708391424
22	1124000727777605582848

[0, 0, 0, 2, 16, 104, 688, 4976, 40192, 362624, 3628288, 39915776, 478999552, 6227016704, 87178283008, 1307674351616, 20922789855232, 355687428030464, 6402373705596928, 121645100408569856, 2432902008176115712, 51090942171708391424, 1124000727777605582848]

cp's OEIS Frontend

A059204 Number of non-unimodal permutations of n items (i.e., those which do not simply go up for the first part and then down for the rest, but at some point go down then up).

Table of values

List of values