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A020054 as a simple table

n a(n)
0 1
1 0
2 0
3 2
4 7
5 34
6 191
7 1255
8 9470
9 80933
10 772544
11 8146833
12 94058896
13 1180011610
14 15983793633
15 232491543752
16 3614186725611
17 59798362187391
18 1049189445651506
19 19457695173900667
20 380309496580785766

[1,0,0,2,7,34,191,1255,9470,80933,772544,8146833,
 94058896,1180011610,15983793633,232491543752,
 3614186725611,59798362187391,1049189445651506,
 19457695173900667,380309496580785766]

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Last modified March 8 07:37 EST 2021. Contains 341941 sequences. (Running on oeis4.)