A340789 - cp's OEIS frontend

A340789 a(n) = (n!)^2 * Sum_{k=1..n} (-1)^(k+1) / (k!)^2.

n	a(n)
0	0
1	1
2	3
3	28
4	447
5	11176
6	402335
7	19714416
8	1261722623
9	102199532464
10	10219953246399
11	1236614342814280
12	178072465365256319
13	30094246646728317912
14	5898472342758750310751
15	1327156277120718819918976
16	339752006942904017899257855
17	98188330006499261172885520096

[0, 1, 3, 28, 447, 11176, 402335, 19714416, 1261722623, 102199532464, 10219953246399, 1236614342814280, 178072465365256319, 30094246646728317912, 5898472342758750310751, 1327156277120718819918976, 339752006942904017899257855, 98188330006499261172885520096]

cp's OEIS Frontend

A340789 a(n) = (n!)^2 * Sum_{k=1..n} (-1)^(k+1) / (k!)^2.

Table of values

List of values