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A051303 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 30
5 605
6 9030
7 110901
8 1200150
9 11932285
10 111885510
11 1006471301
12 8786447670
13 75039565965
14 630534185190
15 5234341175701
16 43059373189590
17 351805681631645
18 2859550165976070
19 23152657123816101
20 186907026783617910
21 1505512392025329325

[0,0,0,1,30,605,9030,110901,1200150,11932285,
 111885510,1006471301,8786447670,75039565965,
 630534185190,5234341175701,43059373189590,
 351805681631645,2859550165976070,
 23152657123816101,186907026783617910,
 1505512392025329325]

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Last modified July 15 23:32 EDT 2020. Contains 335774 sequences. (Running on oeis4.)