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A157309 as a simple table

n a(n)
0 1
1 1
2 0
3 -1
4 0
5 9
6 0
7 -176
8 0
9 5693
10 0
11 -272185
12 0
13 18043492
14 0
15 -1587355800
16 0
17 179258676373
18 0
19 -25305967691715
20 0
21 4370075849887361
22 0
23 -906689353191842372
24 0
25 222613537277330398444
26 0
27 -63850898347335510126988

[1,1,0,-1,0,9,0,-176,0,5693,0,-272185,0,18043492,
 0,-1587355800,0,179258676373,0,-25305967691715,0,
 4370075849887361,0,-906689353191842372,0,
 222613537277330398444,0,-63850898347335510126988]

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Last modified September 25 20:01 EDT 2021. Contains 347659 sequences. (Running on oeis4.)