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A005415 as a simple table

n a(n)
0 1
1 0
2 1
3 2
4 15
5 140
6 1915
7 33810
8 734545
9 18929960
10 564216345
11 19088149850
12 722508543295
13 30249199720740
14 1387823333771875
15 69238799231051450
16 3731906171773805025
17 216101966957781304400
18 13379538319131196637425
19 881962125004262056604850

[1,0,1,2,15,140,1915,33810,734545,18929960,
 564216345,19088149850,722508543295,30249199720740,
 1387823333771875,69238799231051450,
 3731906171773805025,216101966957781304400,
 13379538319131196637425,881962125004262056604850]

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Last modified March 19 07:04 EDT 2024. Contains 370953 sequences. (Running on oeis4.)