A026538 - cp's OEIS frontend

A026538 a(n) = T(n,n-1), T given by A026536. Also a(n) = number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 1.

n	a(n)
1	1
2	1
3	3
4	6
5	13
6	33
7	65
8	180
9	346
10	990
11	1897
12	5502
13	10571
14	30863
15	59523
16	174456
17	337672
18	992304
19	1926650
20	5673140
21	11043858
22	32571858
23	63548069
24	187675644
25	366849016
26	1084649644
27	2123604927
28	6284986554
29	12322549765
30	36501029265

[1, 1, 3, 6, 13, 33, 65, 180, 346, 990, 1897, 5502, 10571, 30863, 59523, 174456, 337672, 992304, 1926650, 5673140, 11043858, 32571858, 63548069, 187675644, 366849016, 1084649644, 2123604927, 6284986554, 12322549765, 36501029265]

cp's OEIS Frontend

A026538 a(n) = T(n,n-1), T given by A026536. Also a(n) = number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 1.

Table of values

List of values