A114633 - cp's OEIS frontend

A114633 a(n) = (n+1)(n+2)/2 Sum_{k=0..floor(n/2)} n!/(n-2*k)!.

n	a(n)
0	1
1	3
2	18
3	70
4	555
5	2961
6	31108
7	213228
8	2799765
9	23455135
10	369569046
11	3659001138
12	67261566463
13	768390239085
14	16142775951240
15	209002145031256
16	4939689441079593
17	71478733600689723
18	1877081987610245530
19	30021068112289683870
20	867211878275933435091
21	15190660464818580038473

[1, 3, 18, 70, 555, 2961, 31108, 213228, 2799765, 23455135, 369569046, 3659001138, 67261566463, 768390239085, 16142775951240, 209002145031256, 4939689441079593, 71478733600689723, 1877081987610245530, 30021068112289683870, 867211878275933435091, 15190660464818580038473]

cp's OEIS Frontend

A114633 a(n) = (n+1)(n+2)/2 Sum_{k=0..floor(n/2)} n!/(n-2*k)!.

Table of values

List of values

cp's OEIS Frontend

A114633 a(n) = (n+1)*(n+2)/2 * Sum_{k=0..floor(n/2)} n!/(n-2*k)!.

Table of values

List of values

A114633 a(n) = (n+1)(n+2)/2 Sum_{k=0..floor(n/2)} n!/(n-2*k)!.