A079980 - cp's OEIS frontend

A079980 Number of permutations of length 2n satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..2n, with k=3, r=3, I={-2,0,1,2}. There is no one such permutation of length 2n+1.

n	a(n)
0	1
1	0
2	1
3	2
4	3
5	8
6	12
7	27
8	52
9	95
10	196
11	369
12	720
13	1408
14	2709
15	5292
16	10249
17	19894
18	38675
19	74992
20	145692
21	282823
22	549000
23	1066095
24	2069496
25	4018065
26	7801024
27	15144960
28	29404281
29	57086680
30	110832225
31	215178138
32	417759539
33	811069560
34	1574664364

[1, 0, 1, 2, 3, 8, 12, 27, 52, 95, 196, 369, 720, 1408, 2709, 5292, 10249, 19894, 38675, 74992, 145692, 282823, 549000, 1066095, 2069496, 4018065, 7801024, 15144960, 29404281, 57086680, 110832225, 215178138, 417759539, 811069560, 1574664364]

cp's OEIS Frontend

A079980 Number of permutations of length 2n satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..2n, with k=3, r=3, I={-2,0,1,2}. There is no one such permutation of length 2n+1.

Table of values

List of values