A224652 - cp's OEIS frontend

A224652 Triangle read by rows: T(n,k) is the number of permutations of n elements with k the (smallest) header (first element) of the longest descending subsequence.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	1
8	5
9	8
10	10
11	1
12	14
13	25
14	35
15	45
16	1
17	42
18	89
19	141
20	196
21	251
22	1
23	132
24	357
25	644
26	966
27	1302
28	1638
29	1
30	429
31	1602
32	3284
33	5300
34	7526
35	9878
36	12300
37	1
38	1430
39	7959
40	18423
41	31947
42	47859
43	65619
44	84765
45	104877
46	1
47	4862
48	43127
49	112255
50	209500
51	331795
52	475738
53	637657
54	813730
55	1000135

[1, 1, 1, 1, 2, 3, 1, 5, 8, 10, 1, 14, 25, 35, 45, 1, 42, 89, 141, 196, 251, 1, 132, 357, 644, 966, 1302, 1638, 1, 429, 1602, 3284, 5300, 7526, 9878, 12300, 1, 1430, 7959, 18423, 31947, 47859, 65619, 84765, 104877, 1, 4862, 43127, 112255, 209500, 331795, 475738, 637657, 813730, 1000135]

cp's OEIS Frontend

A224652 Triangle read by rows: T(n,k) is the number of permutations of n elements with k the (smallest) header (first element) of the longest descending subsequence.

Table of values

List of values