A032131 - cp's OEIS frontend

A032131 Shifts left 2 places under the "BIK" (reversible, indistinct, unlabeled) transform with a(1) = a(2) = 1.

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	7
7	13
8	31
9	66
10	160
11	369
12	907
13	2191
14	5461
15	13558
16	34209
17	86426
18	220359
19	563475
20	1449282
21	3739365
22	9688104
23	25173917
24	65621067
25	171498288
26	449361649
27	1180078602
28	3105740797
29	8189749105
30	21636207962
31	57257857968
32	151771200002
33	402899862910
34	1071076810324
35	2851165864937

[1, 1, 1, 2, 3, 7, 13, 31, 66, 160, 369, 907, 2191, 5461, 13558, 34209, 86426, 220359, 563475, 1449282, 3739365, 9688104, 25173917, 65621067, 171498288, 449361649, 1180078602, 3105740797, 8189749105, 21636207962, 57257857968, 151771200002, 402899862910, 1071076810324, 2851165864937]

cp's OEIS Frontend

A032131 Shifts left 2 places under the "BIK" (reversible, indistinct, unlabeled) transform with a(1) = a(2) = 1.

Table of values

List of values