A136718 - cp's OEIS frontend

A136718 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k entries divisible by 3 that are followed by a smaller entry (n>=1, k>=0).

n	a(n)
1	1
2	2
3	2
4	4
5	12
6	12
7	72
8	48
9	72
10	456
11	192
12	960
13	3120
14	960
15	10800
16	23760
17	5760
18	10800
19	133920
20	183600
21	34560
22	241920
23	1572480
24	1572480
25	241920
26	4233600
27	18869760
28	14878080
29	1935360
30	4233600
31	84309120
32	233331840
33	141644160
34	15482880

[1, 2, 2, 4, 12, 12, 72, 48, 72, 456, 192, 960, 3120, 960, 10800, 23760, 5760, 10800, 133920, 183600, 34560, 241920, 1572480, 1572480, 241920, 4233600, 18869760, 14878080, 1935360, 4233600, 84309120, 233331840, 141644160, 15482880]

cp's OEIS Frontend

A136718 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k entries divisible by 3 that are followed by a smaller entry (n>=1, k>=0).

Table of values

List of values