A343535 - cp's OEIS frontend

A343535 Number T(n,k) of permutations of [n] having exactly k consecutive triples j, j+1, j-1; triangle T(n,k), n>=0, 0<=k<=floor(n/3), read by rows.

n	a(n)
0	1
1	1
2	2
3	5
4	1
5	20
6	4
7	102
8	18
9	626
10	92
11	2
12	4458
13	564
14	18
15	36144
16	4032
17	144
18	328794
19	32898
20	1182
21	6
22	3316944
23	301248
24	10512
25	96
26	36755520
27	3057840
28	102240
29	1200
30	443828184
31	34073184
32	1085904
33	14304
34	24
35	5800823880
36	413484240
37	12538080
38	174000
39	600
40	81591320880

[1, 1, 2, 5, 1, 20, 4, 102, 18, 626, 92, 2, 4458, 564, 18, 36144, 4032, 144, 328794, 32898, 1182, 6, 3316944, 301248, 10512, 96, 36755520, 3057840, 102240, 1200, 443828184, 34073184, 1085904, 14304, 24, 5800823880, 413484240, 12538080, 174000, 600, 81591320880]

cp's OEIS Frontend

A343535 Number T(n,k) of permutations of [n] having exactly k consecutive triples j, j+1, j-1; triangle T(n,k), n>=0, 0<=k<=floor(n/3), read by rows.

Table of values

List of values