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A007474 as a simple table

n a(n)
0 1
1 0
2 1
3 2
4 7
5 36
6 300
7 3218
8 42335
9 644808
10 11119515
11 213865382
12 4537496680
13 105270612952
14 2651295555949
15 72042968876506
16 2100886276796969
17 65446290562491916
18 2169090198219290966
19 76211647261082309466
20 2829612806029873399561

[1,0,1,2,7,36,300,3218,42335,644808,11119515,
 213865382,4537496680,105270612952,2651295555949,
 72042968876506,2100886276796969,65446290562491916,
 2169090198219290966,76211647261082309466,
 2829612806029873399561]

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Last modified January 26 08:18 EST 2020. Contains 331278 sequences. (Running on oeis4.)