A026288 - cp's OEIS frontend

A026288 Number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, s(1) = 1, s(n) = 2, |s(i) - s(i-1)| <= 1 for i >= 2, |s(2) - s(1)| = 1, |s(3) - s(2)| = 1 if s(2) = 1. Also T(n,n-2), where T is the array in A026268.

n	a(n)
2	1
3	2
4	5
5	14
6	38
7	104
8	285
9	784
10	2164
11	5994
12	16658
13	46442
14	129868
15	364182
16	1023960
17	2886174
18	8153952
19	23086374
20	65497653
21	186175794
22	530148414
23	1512174076
24	4320093569
25	12360382436
26	35414530188
27	101603373430
28	291864076387
29	839402336610

[1, 2, 5, 14, 38, 104, 285, 784, 2164, 5994, 16658, 46442, 129868, 364182, 1023960, 2886174, 8153952, 23086374, 65497653, 186175794, 530148414, 1512174076, 4320093569, 12360382436, 35414530188, 101603373430, 291864076387, 839402336610]

cp's OEIS Frontend

A026288 Number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, s(1) = 1, s(n) = 2, |s(i) - s(i-1)| <= 1 for i >= 2, |s(2) - s(1)| = 1, |s(3) - s(2)| = 1 if s(2) = 1. Also T(n,n-2), where T is the array in A026268.

Table of values

List of values