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A006923 as a simple table

n a(n)
0 0
1 0
2 1
3 1
4 3
5 13
6 63
7 399
8 3268
9 33496
10 412943
11 5883727
12 94159721
13 1661723296
14 31954666517
15 663988090257
16 14814445040728

[0,0,1,1,3,13,63,399,3268,33496,412943,5883727,
 94159721,1661723296,31954666517,663988090257,
 14814445040728]

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Last modified April 20 22:22 EDT 2019. Contains 322310 sequences. (Running on oeis4.)