A024427 - cp's OEIS frontend

A024427 S(n,1) + S(n-1,2) + S(n-2,3) + ... + S(n+1-k,k), where k = floor((n+1)/2) and S(i,j) are Stirling numbers of the second kind.

n	a(n)
1	1
2	1
3	2
4	4
5	9
6	22
7	58
8	164
9	495
10	1587
11	5379
12	19195
13	71872
14	281571
15	1151338
16	4902687
17	21696505
18	99598840
19	473466698
20	2327173489
21	11810472444
22	61808852380
23	333170844940
24	1847741027555
25	10532499571707
26	61649191750137
27	370208647200165
28	2278936037262610

[1, 1, 2, 4, 9, 22, 58, 164, 495, 1587, 5379, 19195, 71872, 281571, 1151338, 4902687, 21696505, 99598840, 473466698, 2327173489, 11810472444, 61808852380, 333170844940, 1847741027555, 10532499571707, 61649191750137, 370208647200165, 2278936037262610]

cp's OEIS Frontend

A024427 S(n,1) + S(n-1,2) + S(n-2,3) + ... + S(n+1-k,k), where k = floor((n+1)/2) and S(i,j) are Stirling numbers of the second kind.

Table of values

List of values