A190160 - cp's OEIS frontend

A190160 Number of peakless Motzkin paths of length n containing no subwords of type uh^ju or dh^jd (j>=1), where u=(1,1), h=(1,0), and d=(1,-1) (can be easily expressed using RNA secondary structure terminology).

n	a(n)
0	1
1	1
2	1
3	2
4	4
5	8
6	15
7	28
8	53
9	102
10	199
11	391
12	773
13	1537
14	3075
15	6189
16	12525
17	25473
18	52037
19	106737
20	219761
21	454041
22	941089
23	1956357
24	4078010
25	8522016
26	17850512
27	37471531
28	78818748
29	166102378
30	350660371
31	741503529
32	1570402564
33	3330730115
34	7073941610
35	15043298781

[1, 1, 1, 2, 4, 8, 15, 28, 53, 102, 199, 391, 773, 1537, 3075, 6189, 12525, 25473, 52037, 106737, 219761, 454041, 941089, 1956357, 4078010, 8522016, 17850512, 37471531, 78818748, 166102378, 350660371, 741503529, 1570402564, 3330730115, 7073941610, 15043298781]

cp's OEIS Frontend

A190160 Number of peakless Motzkin paths of length n containing no subwords of type uh^ju or dh^jd (j>=1), where u=(1,1), h=(1,0), and d=(1,-1) (can be easily expressed using RNA secondary structure terminology).

Table of values

List of values