A026071 - cp's OEIS frontend

A026071 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; |s(i) - s(i-1)| <= 1 for i >= 3, s(n) = 4. Also a(n) = T(n,n-4), where T is the array defined in A024996.

n	a(n)
4	1
5	3
6	12
7	40
8	133
9	427
10	1352
11	4224
12	13080
13	40216
14	122980
15	374452
16	1136226
17	3438150
18	10380048
19	31279728
20	94114125
21	282804759
22	848886180
23	2545759328
24	7628718845
25	22845628531
26	68377674280
27	204560102800
28	611720539235
29	1828673918721

[1, 3, 12, 40, 133, 427, 1352, 4224, 13080, 40216, 122980, 374452, 1136226, 3438150, 10380048, 31279728, 94114125, 282804759, 848886180, 2545759328, 7628718845, 22845628531, 68377674280, 204560102800, 611720539235, 1828673918721]

cp's OEIS Frontend

A026071 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; |s(i) - s(i-1)| <= 1 for i >= 3, s(n) = 4. Also a(n) = T(n,n-4), where T is the array defined in A024996.

Table of values

List of values