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A002508 as a simple table

n a(n)
3 1
4 -2
5 9
6 -4
7 28
8 18
9 118
10 80
11 504
12 466
13 1631
14 2160
15 5466
16 7498
17 17658
18 25088
19 51944
20 78660
21 149099
22 226544
23 412920
24 627830
25 1090006
26 1671840
27 2796805
28 4263984
29 6969690
30 10555224
31 16836620
32 25396506
33 39699240
34 59409184
35 91460952
36 135795598
37 205951071
38 303740496
39 454672142

[1,-2,9,-4,28,18,118,80,504,466,1631,2160,5466,
 7498,17658,25088,51944,78660,149099,226544,412920,
 627830,1090006,1671840,2796805,4263984,6969690,
 10555224,16836620,25396506,39699240,59409184,
 91460952,135795598,205951071,303740496,454672142]

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Last modified April 24 15:57 EDT 2024. Contains 371961 sequences. (Running on oeis4.)