A177267 - cp's OEIS frontend

A177267 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having genus k (see first comment for definition of genus).

n	a(n)
1	1
2	2
3	0
4	5
5	1
6	0
7	14
8	10
9	0
10	0
11	42
12	70
13	8
14	0
15	0
16	132
17	420
18	168
19	0
20	0
21	0
22	429
23	2310
24	2121
25	180
26	0
27	0
28	0
29	1430
30	12012
31	20790
32	6088
33	0
34	0
35	0
36	0
37	4862
38	60060
39	174174
40	115720
41	8064
42	0
43	0
44	0
45	0
46	16796
47	291720
48	1309308
49	1624480
50	386496
51	0
52	0
53	0
54	0
55	0
56	58786
57	1385670
58	9087078
59	18748730
60	10031736
61	604800
62	0
63	0
64	0
65	0
66	0
67	208012
68	6466460
69	59306676
70	188208020
71	186698512
72	38113920
73	0

[1, 2, 0, 5, 1, 0, 14, 10, 0, 0, 42, 70, 8, 0, 0, 132, 420, 168, 0, 0, 0, 429, 2310, 2121, 180, 0, 0, 0, 1430, 12012, 20790, 6088, 0, 0, 0, 0, 4862, 60060, 174174, 115720, 8064, 0, 0, 0, 0, 16796, 291720, 1309308, 1624480, 386496, 0, 0, 0, 0, 0, 58786, 1385670, 9087078, 18748730, 10031736, 604800, 0, 0, 0, 0, 0, 208012, 6466460, 59306676, 188208020, 186698512, 38113920, 0]

cp's OEIS Frontend

A177267 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having genus k (see first comment for definition of genus).

Table of values

List of values