A307358 - cp's OEIS frontend

A307358 a(n) = Sum_{0<=i<=j<=k<=n} (-1)^(i+j+k) * (i+j+k)!/(i!j!k!).

n	a(n)
0	1
1	-4
2	72
3	-1345
4	27886
5	-610558
6	13861334
7	-322838475
8	7663363513
9	-184598740512
10	4498935186891
11	-110693299767349
12	2745124008220296
13	-68532209858173364
14	1720678086867077832
15	-43415209670536390089
16	1100146390869600888470

[1, -4, 72, -1345, 27886, -610558, 13861334, -322838475, 7663363513, -184598740512, 4498935186891, -110693299767349, 2745124008220296, -68532209858173364, 1720678086867077832, -43415209670536390089, 1100146390869600888470]

cp's OEIS Frontend

A307358 a(n) = Sum_{0<=i<=j<=k<=n} (-1)^(i+j+k) * (i+j+k)!/(i!j!k!).

Table of values

List of values

cp's OEIS Frontend

A307358 a(n) = Sum_{0<=i<=j<=k<=n} (-1)^(i+j+k) * (i+j+k)!/(i!*j!*k!).

Table of values

List of values

A307358 a(n) = Sum_{0<=i<=j<=k<=n} (-1)^(i+j+k) * (i+j+k)!/(i!j!k!).