A032173 - cp's OEIS frontend

A032173 Sequence (a(n): n >= 1) that shifts left 2 places under the "CHK" (necklace, identity, unlabeled) transform and has initial terms a(1) = a(2) = 1.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	7
8	12
9	28
10	55
11	122
12	258
13	574
14	1254
15	2813
16	6283
17	14220
18	32237
19	73631
20	168660
21	388331
22	896790
23	2078822
24	4832343
25	11266422
26	26332119
27	61694574
28	144858260
29	340829231
30	803427128
31	1897269215
32	4487725726

[1, 1, 1, 1, 2, 3, 7, 12, 28, 55, 122, 258, 574, 1254, 2813, 6283, 14220, 32237, 73631, 168660, 388331, 896790, 2078822, 4832343, 11266422, 26332119, 61694574, 144858260, 340829231, 803427128, 1897269215, 4487725726]

cp's OEIS Frontend

A032173 Sequence (a(n): n >= 1) that shifts left 2 places under the "CHK" (necklace, identity, unlabeled) transform and has initial terms a(1) = a(2) = 1.

Table of values

List of values