A356328 - cp's OEIS frontend

A356328 a(n) = n! * Sum_{k=0..floor(n/3)} (n - 3k)^k/(6^k (n - 3*k)!).

n	a(n)
0	1
1	1
2	1
3	1
4	5
5	21
6	61
7	281
8	2521
9	15625
10	84841
11	971521
12	10646461
13	83366141
14	962405445
15	15445935961
16	181502928881
17	2182235585041
18	42297481449361
19	714940186390465
20	10007476059187381
21	204722588272279141
22	4600003555996715021
23	80767827313930590681

[1, 1, 1, 1, 5, 21, 61, 281, 2521, 15625, 84841, 971521, 10646461, 83366141, 962405445, 15445935961, 181502928881, 2182235585041, 42297481449361, 714940186390465, 10007476059187381, 204722588272279141, 4600003555996715021, 80767827313930590681]

cp's OEIS Frontend

A356328 a(n) = n! * Sum_{k=0..floor(n/3)} (n - 3k)^k/(6^k (n - 3*k)!).

Table of values

List of values

cp's OEIS Frontend

A356328 a(n) = n! * Sum_{k=0..floor(n/3)} (n - 3*k)^k/(6^k * (n - 3*k)!).

Table of values

List of values

A356328 a(n) = n! * Sum_{k=0..floor(n/3)} (n - 3k)^k/(6^k (n - 3*k)!).