A362300 - cp's OEIS frontend

A362300 a(n) = n! * Sum_{k=0..floor(n/3)} (n/3)^k * binomial(n-2k,k)/(n-2k)!.

n	a(n)
0	1
1	1
2	1
3	7
4	33
5	101
6	1681
7	14211
8	72577
9	1906633
10	23242401
11	166218911
12	5966236321
13	95016917997
14	873707885233
15	39767572858651
16	781865428682241
17	8787169718273681
18	484500265577706817
19	11335266937098816183
20	150554918241183405601
21	9749671976020428623221

[1, 1, 1, 7, 33, 101, 1681, 14211, 72577, 1906633, 23242401, 166218911, 5966236321, 95016917997, 873707885233, 39767572858651, 781865428682241, 8787169718273681, 484500265577706817, 11335266937098816183, 150554918241183405601, 9749671976020428623221]

cp's OEIS Frontend

A362300 a(n) = n! * Sum_{k=0..floor(n/3)} (n/3)^k * binomial(n-2k,k)/(n-2k)!.

Table of values

List of values

cp's OEIS Frontend

A362300 a(n) = n! * Sum_{k=0..floor(n/3)} (n/3)^k * binomial(n-2*k,k)/(n-2*k)!.

Table of values

List of values

A362300 a(n) = n! * Sum_{k=0..floor(n/3)} (n/3)^k * binomial(n-2k,k)/(n-2k)!.