A026302 - cp's OEIS frontend

A026302 a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 0, s(2n) = n. Also a(n) = T(2n,n), where T is the array in A026300.

n	a(n)
0	1
1	2
2	9
3	44
4	230
5	1242
6	6853
7	38376
8	217242
9	1239980
10	7123765
11	41141916
12	238637282
13	1389206210
14	8112107475
15	47495492400
16	278722764954
17	1638970147188
18	9654874654438
19	56965811111240
20	336590781348276
21	1991357644501170

[1, 2, 9, 44, 230, 1242, 6853, 38376, 217242, 1239980, 7123765, 41141916, 238637282, 1389206210, 8112107475, 47495492400, 278722764954, 1638970147188, 9654874654438, 56965811111240, 336590781348276, 1991357644501170]

cp's OEIS Frontend

A026302 a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 0, s(2n) = n. Also a(n) = T(2n,n), where T is the array in A026300.

Table of values

List of values