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A291702 as a simple table

na(n)
01
1-1
21
3-4
413
5-36
6100
7-281
8797
9-2281
106546
11-18778
1253872
13-154662
14444263
15-1276284
163665773
17-10524939
1830203731
19-86624174
20248257298
21-710882708
222033663952
23-5811660425
2416588828304
25-47291077636
26134630218334
27-382697080366
281086083438999

[1,-1,1,-4,13,-36,100,-281,797,-2281,6546,-18778,
 53872,-154662,444263,-1276284,3665773,-10524939,
 30203731,-86624174,248257298,-710882708,
 2033663952,-5811660425,16588828304,-47291077636,
 134630218334,-382697080366,1086083438999]