login

A177774 as a simple table

na(n)
11
21
3-2
412
5-120
61684
7-31120
8730167
9-21231238
10750298888
11-31687276404
121575667784824
13-91052587870552
146045175643449008
15-456560323906523200
1638886167319641201692
17-3706800668529432678016
18392824268201002386964776

[1,1,-2,12,-120,1684,-31120,730167,-21231238,
 750298888,-31687276404,1575667784824,
 -91052587870552,6045175643449008,
 -456560323906523200,38886167319641201692,
 -3706800668529432678016,392824268201002386964776]