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A073420 as a simple table

n a(n)
0 1
1 -1
2 -1
3 -1
4 0
5 -2
6 -4
7 -4
8 -8
9 -10
10 -17
11 -10
12 6
13 45
14 260
15 604
16 1285
17 3329
18 6755
19 12550
20 25790
21 46302
22 75922
23 129739
24 188164
25 215880
26 177637
27 -208052
28 -1480885
29 -4563499
30 -11984644
31 -28275270
32 -61059278
33 -126088969
34 -248020723
35 -462216478
36 -823834918
37 -1383451194
38 -2136524063

[1,-1,-1,-1,0,-2,-4,-4,-8,-10,-17,-10,6,45,260,
 604,1285,3329,6755,12550,25790,46302,75922,129739,
 188164,215880,177637,-208052,-1480885,-4563499,
 -11984644,-28275270,-61059278,-126088969,
 -248020723,-462216478,-823834918,-1383451194,
 -2136524063]

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Last modified August 13 05:18 EDT 2022. Contains 356077 sequences. (Running on oeis4.)