A357147 - cp's OEIS frontend

A357147 a(n) = n! * Sum_{k=0..floor(n/3)} (n - 3k)^(3k)/(n - 3*k)!.

n	a(n)
0	1
1	1
2	1
3	1
4	25
5	481
6	3241
7	18481
8	1332241
9	44198785
10	623190961
11	15416707681
12	1602405014761
13	68167258954081
14	1598025440555545
15	134130467333575441
16	14793638741719612321
17	730659540435131811841
18	34674365632872552887521
19	5776415685538277157146305

[1, 1, 1, 1, 25, 481, 3241, 18481, 1332241, 44198785, 623190961, 15416707681, 1602405014761, 68167258954081, 1598025440555545, 134130467333575441, 14793638741719612321, 730659540435131811841, 34674365632872552887521, 5776415685538277157146305]

cp's OEIS Frontend

A357147 a(n) = n! * Sum_{k=0..floor(n/3)} (n - 3k)^(3k)/(n - 3*k)!.

Table of values

List of values

cp's OEIS Frontend

A357147 a(n) = n! * Sum_{k=0..floor(n/3)} (n - 3*k)^(3*k)/(n - 3*k)!.

Table of values

List of values

A357147 a(n) = n! * Sum_{k=0..floor(n/3)} (n - 3k)^(3k)/(n - 3*k)!.