A332800 - cp's OEIS frontend

A332800 Number of permutations sigma of [n] such that (sigma(k) mod sigma(k+1)) <= (sigma(k+1) mod sigma(k+2)) for 1 <= k <= n - 2.

n	a(n)
0	1
1	1
2	2
3	4
4	9
5	21
6	44
7	109
8	241
9	530
10	1176
11	3180
12	6456
13	14835
14	34672
15	81877
16	179434
17	479275
18	977224
19	2503363
20	5339049
21	11207391
22	28379591
23	82473713
24	166689486
25	370775384
26	877910547
27	2150475950
28	4608590865
29	12146671367
30	24620749285
31	64137229920
32	143062854926

[1, 1, 2, 4, 9, 21, 44, 109, 241, 530, 1176, 3180, 6456, 14835, 34672, 81877, 179434, 479275, 977224, 2503363, 5339049, 11207391, 28379591, 82473713, 166689486, 370775384, 877910547, 2150475950, 4608590865, 12146671367, 24620749285, 64137229920, 143062854926]

cp's OEIS Frontend

A332800 Number of permutations sigma of [n] such that (sigma(k) mod sigma(k+1)) <= (sigma(k+1) mod sigma(k+2)) for 1 <= k <= n - 2.

Table of values

List of values