A070925 - cp's OEIS frontend

A070925 Number of subsets of A = {1,2,...,n} that have the same center of gravity as A, i.e., (n+1)/2.

n	a(n)
1	1
2	1
3	3
4	3
5	7
6	7
7	19
8	17
9	51
10	47
11	151
12	137
13	471
14	427
15	1519
16	1391
17	5043
18	4651
19	17111
20	15883
21	59007
22	55123
23	206259
24	193723
25	729095
26	688007
27	2601639
28	2465133
29	9358943
30	8899699
31	33904323
32	32342235
33	123580883
34	118215779
35	452902071
36	434314137
37	1667837679
38	1602935103

[1, 1, 3, 3, 7, 7, 19, 17, 51, 47, 151, 137, 471, 427, 1519, 1391, 5043, 4651, 17111, 15883, 59007, 55123, 206259, 193723, 729095, 688007, 2601639, 2465133, 9358943, 8899699, 33904323, 32342235, 123580883, 118215779, 452902071, 434314137, 1667837679, 1602935103]

cp's OEIS Frontend

A070925 Number of subsets of A = {1,2,...,n} that have the same center of gravity as A, i.e., (n+1)/2.

Table of values

List of values