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A318643 as a simple table

n a(n)
1 1
2 1
3 1
4 25
5 73
6 1025
7 4913
8 48985
9 311305
10 2393953
11 17903761
12 140986201
13 1096160649
14 7777051265
15 61667165361
16 597402170649
17 4836234935497
18 4245154618465
19 -25145215353455
20 12982383457107609
21 139920724294631369
22 -5479397854898810111
23 -68618853272591110863
24 3588130738987950942681
25 48514725864891831998601
26 -2781644195772240632990623

[1,1,1,25,73,1025,4913,48985,311305,2393953,
 17903761,140986201,1096160649,7777051265,
 61667165361,597402170649,4836234935497,
 4245154618465,-25145215353455,12982383457107609,
 139920724294631369,-5479397854898810111,
 -68618853272591110863,3588130738987950942681,
 48514725864891831998601,
 -2781644195772240632990623]

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Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)