A307350 - cp's OEIS frontend

A307350 a(n) = -Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} (-1)^(i+j+k) * (i+j+k)!/(3!i!j!*k!).

n	a(n)
0	0
1	1
2	-5
3	120
4	-2380
5	52556
6	-1192625
7	27798310
8	-660128942
9	15907062666
10	-387785597485
11	9543399745815
12	-236715891871160
13	5910596888393926
14	-148421725618783545
15	3745355227481531010
16	-94917946415633366050
17	2414582011729590475886

[0, 1, -5, 120, -2380, 52556, -1192625, 27798310, -660128942, 15907062666, -387785597485, 9543399745815, -236715891871160, 5910596888393926, -148421725618783545, 3745355227481531010, -94917946415633366050, 2414582011729590475886]

cp's OEIS Frontend

A307350 a(n) = -Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} (-1)^(i+j+k) * (i+j+k)!/(3!i!j!*k!).

Table of values

List of values

cp's OEIS Frontend

A307350 a(n) = -Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} (-1)^(i+j+k) * (i+j+k)!/(3!*i!*j!*k!).

Table of values

List of values

A307350 a(n) = -Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} (-1)^(i+j+k) * (i+j+k)!/(3!i!j!*k!).