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A019170 as a simple table

n a(n)
3 0
4 0
5 4
6 2
7 5
8 21
9 42
10 88
11 261
12 592
13 1384
14 3656
15 8815
16 21561
17 55669
18 140789
19 357647
20 925262
21 2401128
22 6262335
23 16412670
24 43201778
25 114204540
26 302442977
27 802726911
28 2136397918
29 5694213070
30 15199124391
31 40644374977

[0,0,4,2,5,21,42,88,261,592,1384,3656,8815,21561,
 55669,140789,357647,925262,2401128,6262335,
 16412670,43201778,114204540,302442977,802726911,
 2136397918,5694213070,15199124391,40644374977]

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Last modified June 12 10:29 EDT 2021. Contains 344946 sequences. (Running on oeis4.)