A024428 - cp's OEIS frontend

A024428 S(n,n) + S(n-1,n-2) + S(n-2,n-4) + ... + S(n-k+1,n-2k+2), where k = [ (n+1)/2 ] and S(i,j) are Stirling numbers of second kind.

n	a(n)
1	1
2	1
3	2
4	4
5	8
6	18
7	42
8	102
9	260
10	684
11	1860
12	5216
13	15020
14	44388
15	134336
16	415672
17	1313696
18	4234904
19	13911528
20	46525992
21	158279872
22	547327904
23	1922455440
24	6854491840
25	24794405328
26	90940138256
27	338037825952
28	1272862982272
29	4853075024192

[1, 1, 2, 4, 8, 18, 42, 102, 260, 684, 1860, 5216, 15020, 44388, 134336, 415672, 1313696, 4234904, 13911528, 46525992, 158279872, 547327904, 1922455440, 6854491840, 24794405328, 90940138256, 338037825952, 1272862982272, 4853075024192]

cp's OEIS Frontend

A024428 S(n,n) + S(n-1,n-2) + S(n-2,n-4) + ... + S(n-k+1,n-2k+2), where k = [ (n+1)/2 ] and S(i,j) are Stirling numbers of second kind.

Table of values

List of values