A339179 - cp's OEIS frontend

A339179 Irregular triangle read by rows: for n >= 2, 2 <= k <= floor(n/2) + 1, T(n,k) = the number of semi-meanders with n top arches, a first arch of length one and k arch groupings.

n	a(n)
2	1
3	1
4	1
5	1
6	2
7	2
8	4
9	4
10	2
11	10
12	10
13	4
14	24
15	24
16	14
17	4
18	66
19	66
20	34
21	8
22	174
23	174
24	106
25	42
26	8
27	504
28	504
29	284
30	98
31	16
32	1406
33	1406
34	878
35	390
36	114
37	16
38	4210
39	4210
40	2486
41	1002
42	258
43	32
44	12198
45	12198
46	7738
47	3652
48	1270
49	290
50	32
51	37378
52	37378
53	22714
54	9962
55	3140
56	642
57	64
58	111278
59	111278
60	71370
61	34986
62	13370
63	3794
64	706
65	64

[1, 1, 1, 1, 2, 2, 4, 4, 2, 10, 10, 4, 24, 24, 14, 4, 66, 66, 34, 8, 174, 174, 106, 42, 8, 504, 504, 284, 98, 16, 1406, 1406, 878, 390, 114, 16, 4210, 4210, 2486, 1002, 258, 32, 12198, 12198, 7738, 3652, 1270, 290, 32, 37378, 37378, 22714, 9962, 3140, 642, 64, 111278, 111278, 71370, 34986, 13370, 3794, 706, 64]

cp's OEIS Frontend

A339179 Irregular triangle read by rows: for n >= 2, 2 <= k <= floor(n/2) + 1, T(n,k) = the number of semi-meanders with n top arches, a first arch of length one and k arch groupings.

Table of values

List of values