A079972 - cp's OEIS frontend

A079972 Number of permutations satisfying -k <= p(i)-i <= r and p(i)-i not in I, i=1..n, with k=1, r=4, I={1,2}.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	4
6	6
7	8
8	11
9	17
10	27
11	41
12	60
13	88
14	132
15	200
16	301
17	449
18	669
19	1001
20	1502
21	2252
22	3370
23	5040
24	7543
25	11297
26	16919
27	25329
28	37912
29	56752
30	84968
31	127216
32	190457
33	285121
34	426841
35	639025
36	956698
37	1432276
38	2144238
39	3210104
40	4805827
41	7194801

[1, 1, 1, 1, 2, 4, 6, 8, 11, 17, 27, 41, 60, 88, 132, 200, 301, 449, 669, 1001, 1502, 2252, 3370, 5040, 7543, 11297, 16919, 25329, 37912, 56752, 84968, 127216, 190457, 285121, 426841, 639025, 956698, 1432276, 2144238, 3210104, 4805827, 7194801]

cp's OEIS Frontend

A079972 Number of permutations satisfying -k <= p(i)-i <= r and p(i)-i not in I, i=1..n, with k=1, r=4, I={1,2}.

Table of values

List of values