A026087 - cp's OEIS frontend

A026087 a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, |s(i) - s(i-1)| = 1 for i = 1,2,3; |s(i) - s(i-1)| <= 1 for i >= 4, s(n) = 4. Also a(n) = T(n,n-4), where T is the array defined in A026082.

n	a(n)
4	1
5	2
6	9
7	28
8	93
9	294
10	925
11	2872
12	8856
13	27136
14	82764
15	251472
16	761774
17	2301924
18	6941898
19	20899680
20	62834397
21	188690634
22	566081421
23	1696873148
24	5082959517
25	15216909686
26	45532045749
27	136182428520
28	407160436435
29	1216953379486
30	3636353333187

[1, 2, 9, 28, 93, 294, 925, 2872, 8856, 27136, 82764, 251472, 761774, 2301924, 6941898, 20899680, 62834397, 188690634, 566081421, 1696873148, 5082959517, 15216909686, 45532045749, 136182428520, 407160436435, 1216953379486, 3636353333187]

cp's OEIS Frontend

A026087 a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, |s(i) - s(i-1)| = 1 for i = 1,2,3; |s(i) - s(i-1)| <= 1 for i >= 4, s(n) = 4. Also a(n) = T(n,n-4), where T is the array defined in A026082.

Table of values

List of values