A140711 - cp's OEIS frontend

A140711 Irregular triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k white corners.

n	a(n)
1	1
2	1
3	1
4	1
5	4
6	1
7	1
8	10
9	12
10	1
11	1
12	20
13	62
14	36
15	1
16	1
17	35
18	217
19	339
20	126
21	2
22	1
23	56
24	602
25	1880
26	1907
27	572
28	22
29	1
30	84
31	1428
32	7656
33	15311
34	12004
35	3514
36	312
37	10
38	1
39	120
40	3024
41	25332
42	85543
43	127804
44	88034
45	28296
46	4342
47	368
48	16

[1, 1, 1, 1, 4, 1, 1, 10, 12, 1, 1, 20, 62, 36, 1, 1, 35, 217, 339, 126, 2, 1, 56, 602, 1880, 1907, 572, 22, 1, 84, 1428, 7656, 15311, 12004, 3514, 312, 10, 1, 120, 3024, 25332, 85543, 127804, 88034, 28296, 4342, 368, 16]

cp's OEIS Frontend

A140711 Irregular triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k white corners.

Table of values

List of values