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A000387 as a simple table

n a(n)
0 0
1 0
2 1
3 0
4 6
5 20
6 135
7 924
8 7420
9 66744
10 667485
11 7342280
12 88107426
13 1145396460
14 16035550531
15 240533257860
16 3848532125880
17 65425046139824
18 1177650830516985
19 22375365779822544
20 447507315596451070
21 9397653627525472260
22 206748379805560389951

[0,0,1,0,6,20,135,924,7420,66744,667485,7342280,
 88107426,1145396460,16035550531,240533257860,
 3848532125880,65425046139824,1177650830516985,
 22375365779822544,447507315596451070,
 9397653627525472260,206748379805560389951]

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Last modified May 30 05:35 EDT 2020. Contains 334712 sequences. (Running on oeis4.)