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A051695 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 90
7 630
8 3780
9 18900
10 94500
11 457380
12 3825360
13 31505760
14 312432120
15 2704501800
16 22984481520
17 179863997040
18 1531709328240
19 13078616488560
20 147223414987200
21 1657733805020160
22 20131890668255520
23 226464779237447520
24 2542924546378413120
25 27053572399079688000

[0,0,0,0,0,90,630,3780,18900,94500,457380,3825360,
 31505760,312432120,2704501800,22984481520,
 179863997040,1531709328240,13078616488560,
 147223414987200,1657733805020160,
 20131890668255520,226464779237447520,
 2542924546378413120,27053572399079688000]

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Last modified August 13 18:00 EDT 2022. Contains 356107 sequences. (Running on oeis4.)