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A019238 as a simple table

n a(n)
3 0
4 1
5 4
6 1
7 12
8 34
9 48
10 96
11 252
12 606
13 1288
14 3134
15 8270
16 19542
17 48694
18 129742
19 332080
20 854110
21 2249258
22 5877476
23 15356834
24 40458364
25 106629524
26 281136526
27 743677614
28 1971538978
29 5234641970
30 13926363260
31 37124297350

[0,1,4,1,12,34,48,96,252,606,1288,3134,8270,19542,
 48694,129742,332080,854110,2249258,5877476,
 15356834,40458364,106629524,281136526,743677614,
 1971538978,5234641970,13926363260,37124297350]

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Last modified July 21 02:02 EDT 2019. Contains 325189 sequences. (Running on oeis4.)