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A019142 as a simple table

n a(n)
3 0
4 2
5 1
6 4
7 6
8 16
9 25
10 104
11 144
12 666
13 1078
14 3264
15 7969
16 18762
17 48833
18 124845
19 310324
20 813758
21 2063236
22 5352749
23 13889492
24 35962972
25 94019550
26 245375231
27 643356339
28 1692200330
29 4457714666
30 11776895987
31 31184936750

[0,2,1,4,6,16,25,104,144,666,1078,3264,7969,18762,
 48833,124845,310324,813758,2063236,5352749,
 13889492,35962972,94019550,245375231,643356339,
 1692200330,4457714666,11776895987,31184936750]

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Last modified December 8 11:05 EST 2022. Contains 358693 sequences. (Running on oeis4.)