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A013181 as a simple table

na(n)
00
11
2-2
37
4-28
5193
6-1400
713319
8-139424
91721281
10-23379712
11357281351
12-5951323904
13108706678273
14-2142923081728
1545591739883975
16-1037606714249216
1725211971076762753
18-650452080060399616

[0,1,-2,7,-28,193,-1400,13319,-139424,1721281,
 -23379712,357281351,-5951323904,108706678273,
 -2142923081728,45591739883975,-1037606714249216,
 25211971076762753,-650452080060399616]