A337151 - cp's OEIS frontend

A337151 a(n) = (n!)^2 * Sum_{k=0..n} (-1)^(n-k) * (k+1) / ((n-k)!)^2.

n	a(n)
0	1
1	1
2	5
3	53
4	977
5	27649
6	1111429
7	60147205
8	4213400897
9	370767834593
10	40025019652901
11	5199763957426741
12	800136077306754385
13	143904538461745813153
14	29906871652295426507237
15	7111902097369951568209349
16	1918658066681198636106335489
17	582817397769914314847061436225

[1, 1, 5, 53, 977, 27649, 1111429, 60147205, 4213400897, 370767834593, 40025019652901, 5199763957426741, 800136077306754385, 143904538461745813153, 29906871652295426507237, 7111902097369951568209349, 1918658066681198636106335489, 582817397769914314847061436225]

cp's OEIS Frontend

A337151 a(n) = (n!)^2 * Sum_{k=0..n} (-1)^(n-k) * (k+1) / ((n-k)!)^2.

Table of values

List of values