A008303 - cp's OEIS frontend

A008303 Triangle read by rows: T(n,k) (n >= 1, 0 <= k <= ceiling(n/2)-1) = number of permutations of [n] with k peaks.

n	a(n)
1	1
2	2
3	4
4	2
5	8
6	16
7	16
8	88
9	16
10	32
11	416
12	272
13	64
14	1824
15	2880
16	272
17	128
18	7680
19	24576
20	7936
21	256
22	31616
23	185856
24	137216
25	7936
26	512
27	128512
28	1304832
29	1841152
30	353792
31	1024
32	518656
33	8728576
34	21253376
35	9061376
36	353792
37	2048
38	2084864
39	56520704
40	222398464
41	175627264
42	22368256

[1, 2, 4, 2, 8, 16, 16, 88, 16, 32, 416, 272, 64, 1824, 2880, 272, 128, 7680, 24576, 7936, 256, 31616, 185856, 137216, 7936, 512, 128512, 1304832, 1841152, 353792, 1024, 518656, 8728576, 21253376, 9061376, 353792, 2048, 2084864, 56520704, 222398464, 175627264, 22368256]

cp's OEIS Frontend

A008303 Triangle read by rows: T(n,k) (n >= 1, 0 <= k <= ceiling(n/2)-1) = number of permutations of [n] with k peaks.

Table of values

List of values