login

A091550 as a simple table

na(n)
21
3160
439900
515120000
68202070800
76058891238400
85860547004312000
97196668193594880000
1010944624305020966560000
1120199809308312018344960000
1244490168120726255724917120000
13115290834599202214240544256000000

[1,160,39900,15120000,8202070800,6058891238400,
 5860547004312000,7196668193594880000,
 10944624305020966560000,
 20199809308312018344960000,
 44490168120726255724917120000,
 115290834599202214240544256000000]