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A064190 as a simple table

n a(n)
0 1
1 2
2 6
3 16
4 48
5 72
6 272
7 816
8 1440
9 1440
10 7936
11 23808
12 44352
13 57600
14 43200
15 353792
16 1061376
17 2027520
18 2903040
19 3024000
20 1814400
21 22368256
22 67104768
23 129964032
24 195379200
25 232243200
26 203212800
27 101606400
28 1903757312
29 5711271936

[1,2,6,16,48,72,272,816,1440,1440,7936,23808,
 44352,57600,43200,353792,1061376,2027520,2903040,
 3024000,1814400,22368256,67104768,129964032,
 195379200,232243200,203212800,101606400,
 1903757312,5711271936]

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Last modified February 21 14:40 EST 2018. Contains 299414 sequences. (Running on oeis4.)