A306644 - cp's OEIS frontend

A306644 a(n) = Sum_{k=0..n} (n^2)!/(k! * (n-k)!)^n.

n	a(n)
0	1
1	2
2	36
3	94080
4	114144030000
5	128569399991042250240
6	231970526672859167062880173363200
7	974076884952864555606703666490413198470021120000
8	13999785014750877128592398884910508842895938385473568105272652000000

[1, 2, 36, 94080, 114144030000, 128569399991042250240, 231970526672859167062880173363200, 974076884952864555606703666490413198470021120000, 13999785014750877128592398884910508842895938385473568105272652000000]

cp's OEIS Frontend

A306644 a(n) = Sum_{k=0..n} (n^2)!/(k! * (n-k)!)^n.

Table of values

List of values