A202848 - cp's OEIS frontend

A202848 Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of even length (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	141
14	44
15	313
16	107
17	3
18	702
19	262
20	14
21	1577
22	663
23	43
24	3581
25	1654
26	138
27	8207
28	4091
29	436
30	1
31	18903
32	10178
33	1275
34	16
35	43770
36	25339
37	3638
38	85
39	101903
40	62952
41	10316
42	331
43	238282
44	156495
45	28743
46	1228
47	559322
48	389374
49	78979
50	4320
51	9

[1, 1, 1, 2, 4, 7, 1, 14, 3, 31, 6, 66, 16, 141, 44, 313, 107, 3, 702, 262, 14, 1577, 663, 43, 3581, 1654, 138, 8207, 4091, 436, 1, 18903, 10178, 1275, 16, 43770, 25339, 3638, 85, 101903, 62952, 10316, 331, 238282, 156495, 28743, 1228, 559322, 389374, 78979, 4320, 9]

cp's OEIS Frontend

A202848 Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of even length (n>=0, k>=0).

Table of values

List of values