A202841 - cp's OEIS frontend

A202841 Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of length 2 (n>=0, k>=0).

n	a(n)
0	1
1	1
2	1
3	2
4	4
5	7
6	1
7	14
8	3
9	31
10	6
11	66
12	16
13	142
14	43
15	316
16	104
17	3
18	708
19	256
20	14
21	1593
22	647
23	43
24	3625
25	1610
26	138
27	8314
28	3990
29	430
30	1
31	19165
32	9944
33	1247
34	16
35	44433
36	24762
37	3552
38	85
39	103557
40	61574
41	10040
42	331
43	242376
44	153270
45	27877
46	1225
47	569514
48	381718
49	76491
50	4272
51	9

[1, 1, 1, 2, 4, 7, 1, 14, 3, 31, 6, 66, 16, 142, 43, 316, 104, 3, 708, 256, 14, 1593, 647, 43, 3625, 1610, 138, 8314, 3990, 430, 1, 19165, 9944, 1247, 16, 44433, 24762, 3552, 85, 103557, 61574, 10040, 331, 242376, 153270, 27877, 1225, 569514, 381718, 76491, 4272, 9]

cp's OEIS Frontend

A202841 Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of length 2 (n>=0, k>=0).

Table of values

List of values