A025181 - cp's OEIS frontend

A025181 a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is an integer, s(0) = 0, |s(1)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2, s(n) = 3. Also a(n) = T(n,n-3), where T is the array defined in A025177.

n	a(n)
3	1
4	3
5	11
6	35
7	111
8	343
9	1050
10	3186
11	9615
12	28897
13	86592
14	258908
15	772863
16	2304225
17	6863496
18	20429784
19	60779403
20	180751617
21	537386595
22	1597372371
23	4747537641
24	14108988509
25	41928203694
26	124598731750
27	370279082745
28	1100428538391
29	3270534249843

[1, 3, 11, 35, 111, 343, 1050, 3186, 9615, 28897, 86592, 258908, 772863, 2304225, 6863496, 20429784, 60779403, 180751617, 537386595, 1597372371, 4747537641, 14108988509, 41928203694, 124598731750, 370279082745, 1100428538391, 3270534249843]

cp's OEIS Frontend

A025181 a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is an integer, s(0) = 0, |s(1)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2, s(n) = 3. Also a(n) = T(n,n-3), where T is the array defined in A025177.

Table of values

List of values