A067281 - cp's OEIS frontend

A067281 Number of permutations of {1,2,3,...,n} where the elements of n are considered indistinguishable if they differ by a power of 2 (for example 3, 12 and 24 are all considered equivalent).

n	a(n)
0	1
1	1
2	1
3	3
4	4
5	20
6	60
7	420
8	840
9	7560
10	37800
11	415800
12	1663200
13	21621600
14	151351200
15	2270268000
16	7264857600
17	123502579200
18	1111523212800
19	21118941043200
20	140792940288000
21	2956651746048000
22	32523169206528000
23	748032891750144000
24	4488197350500864000

[1, 1, 1, 3, 4, 20, 60, 420, 840, 7560, 37800, 415800, 1663200, 21621600, 151351200, 2270268000, 7264857600, 123502579200, 1111523212800, 21118941043200, 140792940288000, 2956651746048000, 32523169206528000, 748032891750144000, 4488197350500864000]

cp's OEIS Frontend

A067281 Number of permutations of {1,2,3,...,n} where the elements of n are considered indistinguishable if they differ by a power of 2 (for example 3, 12 and 24 are all considered equivalent).

Table of values

List of values