A376743 - cp's OEIS frontend

A376743 Number of permutations (p(1),p(2),...,p(n)) of (1,2,...,n) such that p(i)-i is in {-2,-1,4} for all i=1,...,n.

n	a(n)
0	1
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	1
11	5
12	5
13	6
14	8
15	11
16	15
17	25
18	35
19	46
20	61
21	85
22	125
23	175
24	245
25	341
26	470
27	650
28	925
29	1300
30	1810
31	2521
32	3520
33	4915
34	6880
35	9640
36	13476
37	18801
38	26251
39	36721
40	51346
41	71776
42	100335
43	140210
44	195886
45	273813
46	382821
47	535105
48	747850
49	1045220

[1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 5, 5, 6, 8, 11, 15, 25, 35, 46, 61, 85, 125, 175, 245, 341, 470, 650, 925, 1300, 1810, 2521, 3520, 4915, 6880, 9640, 13476, 18801, 26251, 36721, 51346, 71776, 100335, 140210, 195886, 273813, 382821, 535105, 747850, 1045220]

cp's OEIS Frontend

A376743 Number of permutations (p(1),p(2),...,p(n)) of (1,2,...,n) such that p(i)-i is in {-2,-1,4} for all i=1,...,n.

Table of values

List of values