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A022901 as a simple table

n a(n)
1 0
2 0
3 1
4 0
5 0
6 0
7 3
8 0
9 3
10 0
11 6
12 0
13 35
14 0
15 88
16 0
17 351
18 0
19 1144
20 0
21 3570
22 0
23 13281
24 0
25 45712
26 0
27 161985
28 0
29 574357
30 0
31 1993704
32 0
33 7191396
34 0
35 26481567
36 0
37 95441234
38 0
39 352520549
40 0
41 1296413520
42 0
43 4775354550
44 0
45 17754091585
46 0
47 65964401274
48 0
49 245645895029
50 0

[0,0,1,0,0,0,3,0,3,0,6,0,35,0,88,0,351,0,1144,0,
 3570,0,13281,0,45712,0,161985,0,574357,0,1993704,
 0,7191396,0,26481567,0,95441234,0,352520549,0,
 1296413520,0,4775354550,0,17754091585,0,
 65964401274,0,245645895029,0]

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Last modified February 25 12:01 EST 2020. Contains 332233 sequences. (Running on oeis4.)