A024998 - cp's OEIS frontend

A024998 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) = 1. Also a(n) = T(n,n-1), where T is the array defined in A024996.

n	a(n)
1	1
2	0
3	3
4	6
5	19
6	52
7	150
8	428
9	1232
10	3552
11	10275
12	29790
13	86559
14	251980
15	734773
16	2145822
17	6275145
18	18373296
19	53856153
20	158025186
21	464112297
22	1364247180
23	4013353932
24	11815188000
25	34807249134
26	102606325136
27	302646363725
28	893175905778

[1, 0, 3, 6, 19, 52, 150, 428, 1232, 3552, 10275, 29790, 86559, 251980, 734773, 2145822, 6275145, 18373296, 53856153, 158025186, 464112297, 1364247180, 4013353932, 11815188000, 34807249134, 102606325136, 302646363725, 893175905778]

cp's OEIS Frontend

A024998 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) = 1. Also a(n) = T(n,n-1), where T is the array defined in A024996.

Table of values

List of values