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A171878 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 1
5 2
6 3
7 6
8 13
9 33
10 120
11 765
12 4831534
13 55040353993453427047
14 410186270246002225336426103593500672000000000000055040353997149550557

[0,0,0,0,1,2,3,6,13,33,120,765,4831534,
 55040353993453427047,
 41018627024600222533642610359350067200000000000005\
 5040353997149550557]

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Last modified May 15 20:04 EDT 2021. Contains 343920 sequences. (Running on oeis4.)