A026126 - cp's OEIS frontend

A026126 a(n) = number of (s(0),s(1),...,s(n)) such that every s(i) is a nonnegative integer, s(0) = 1, s(n) = 5, |s(1) - s(0)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2. Also a(n) = T(n,n-4), where T is the array in A026120.

n	a(n)
4	1
5	4
6	16
7	56
8	188
9	608
10	1922
11	5972
12	18326
13	55704
14	168090
15	504348
16	1506531
17	4484208
18	13309572
19	39414568
20	116508361
21	343890196
22	1013840836
23	2986129168
24	8788591801
25	25850576024
26	76000747820
27	223361900840
28	656270632875
29	1927845012756

[1, 4, 16, 56, 188, 608, 1922, 5972, 18326, 55704, 168090, 504348, 1506531, 4484208, 13309572, 39414568, 116508361, 343890196, 1013840836, 2986129168, 8788591801, 25850576024, 76000747820, 223361900840, 656270632875, 1927845012756]

cp's OEIS Frontend

A026126 a(n) = number of (s(0),s(1),...,s(n)) such that every s(i) is a nonnegative integer, s(0) = 1, s(n) = 5, |s(1) - s(0)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2. Also a(n) = T(n,n-4), where T is the array in A026120.

Table of values

List of values