A357146 - cp's OEIS frontend

A357146 a(n) = n! * Sum_{k=0..floor(n/2)} (n - 2k)^(2k)/(n - 2*k)!.

n	a(n)
0	1
1	1
2	1
3	7
4	49
5	301
6	6241
7	74131
8	1722337
9	46346329
10	1090339201
11	48905462431
12	1584330498961
13	81705172522117
14	4191355357015009
15	223743062044497451
16	16563314120270608321
17	1027165911865738200241
18	91346158358120706564097
19	7395168869747626389974839

[1, 1, 1, 7, 49, 301, 6241, 74131, 1722337, 46346329, 1090339201, 48905462431, 1584330498961, 81705172522117, 4191355357015009, 223743062044497451, 16563314120270608321, 1027165911865738200241, 91346158358120706564097, 7395168869747626389974839]

cp's OEIS Frontend

A357146 a(n) = n! * Sum_{k=0..floor(n/2)} (n - 2k)^(2k)/(n - 2*k)!.

Table of values

List of values

cp's OEIS Frontend

A357146 a(n) = n! * Sum_{k=0..floor(n/2)} (n - 2*k)^(2*k)/(n - 2*k)!.

Table of values

List of values

A357146 a(n) = n! * Sum_{k=0..floor(n/2)} (n - 2k)^(2k)/(n - 2*k)!.