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A094218 as a simple table

n a(n)
1 0
2 0
3 0
4 2
5 25
6 198
7 1274
8 7280
9 38556
10 193800
11 937992
12 4412826
13 20309575
14 91861770
15 409704750
16 1806342720
17 7887861960
18 34166674800
19 146977222320
20 628521016500
21 2673950235138
22 11324837666604
23 47773836727540
24 200828153398752

[0,0,0,2,25,198,1274,7280,38556,193800,937992,
 4412826,20309575,91861770,409704750,1806342720,
 7887861960,34166674800,146977222320,628521016500,
 2673950235138,11324837666604,47773836727540,
 200828153398752]

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Last modified April 5 13:14 EDT 2020. Contains 333241 sequences. (Running on oeis4.)