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A097397 as a simple table

na(n)
01
11
21
35
49
5129
657
79141
8-36879
91430049
10-15439407
11418019205
12-7404957255
13196896257505
14-4656470025015
15134136890777205
16-3845524501226655
17123250625100419265
18-4085349586734306015
19145973136800663973765

[1,1,1,5,9,129,57,9141,-36879,1430049,-15439407,
 418019205,-7404957255,196896257505,-4656470025015,
 134136890777205,-3845524501226655,
 123250625100419265,-4085349586734306015,
 145973136800663973765]