A218538 - cp's OEIS frontend

A218538 Triangle read by rows: T(n,k) is the number of permutations of{1,2,...,n} avoiding [x,x+1] having genus k (see first comment for definition of genus).

n	a(n)
1	1
2	1
3	0
4	3
5	0
6	0
7	7
8	4
9	0
10	0
11	19
12	29
13	5
14	0
15	0
16	53
17	180
18	76
19	0
20	0
21	0
22	153
23	1004
24	901
25	61
26	0
27	0
28	0
29	453
30	5035
31	8884
32	2315
33	0
34	0
35	0
36	0
37	1367
38	23653
39	74177
40	46285
41	2847
42	0
43	0
44	0
45	0
46	4191
47	106414
48	546626
49	667640
50	143586
51	0
52	0
53	0
54	0
55	0
56	13015
57	463740
58	3658723
59	7777935
60	3896494
61	209624
62	0

[1, 1, 0, 3, 0, 0, 7, 4, 0, 0, 19, 29, 5, 0, 0, 53, 180, 76, 0, 0, 0, 153, 1004, 901, 61, 0, 0, 0, 453, 5035, 8884, 2315, 0, 0, 0, 0, 1367, 23653, 74177, 46285, 2847, 0, 0, 0, 0, 4191, 106414, 546626, 667640, 143586, 0, 0, 0, 0, 0, 13015, 463740, 3658723, 7777935, 3896494, 209624, 0]

cp's OEIS Frontend

A218538 Triangle read by rows: T(n,k) is the number of permutations of{1,2,...,n} avoiding [x,x+1] having genus k (see first comment for definition of genus).

Table of values

List of values