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A009455 as a simple table

na(n)
00
11
2-1
3-2
46
5-15
675
7-492
83668
9-30955
10291555
11-3025926
1234283106
13-420908163
145566032199
15-78872781080
161192366871400
17-19156320275703
18325945717605927
19-5855722497051210
20110770076684790590
21-2200845760320344599

[0,1,-1,-2,6,-15,75,-492,3668,-30955,291555,
 -3025926,34283106,-420908163,5566032199,
 -78872781080,1192366871400,-19156320275703,
 325945717605927,-5855722497051210,
 110770076684790590,-2200845760320344599]