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A064583 as a simple table

n a(n)
0 0
1 0
2 816
3 53136
4 986880
5 9390000
6 58831920
7 276825696
8 1057222656
9 3444262560
10 9900990000
11 25724822640
12 61490347776
13 137047559376
14 287786357040
15 574098840000
16 1095233372160
17 2009042197056
18 3559481173296
19 6114129610320
20 10214463840000
21 16642143690480
22 26505160063536

[0,0,816,53136,986880,9390000,58831920,276825696,
 1057222656,3444262560,9900990000,25724822640,
 61490347776,137047559376,287786357040,
 574098840000,1095233372160,2009042197056,
 3559481173296,6114129610320,10214463840000,
 16642143690480,26505160063536]

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Last modified July 24 03:01 EDT 2019. Contains 325290 sequences. (Running on oeis4.)