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A247120 as a simple table

n a(n)
0 1
1 0
2 4
3 0
4 16
5 32
6 76
7 384
8 386
9 2976
10 3952
11 20520
12 41104
13 136160
14 393624
15 1027072
16 3412146
17 8470840
18 27988904
19 74155272
20 230939032
21 655493408
22 1942645984
23 5765577688
24 16807041186
25 50708538824
26 148118970352
27 446903215688
28 1320213337712
29 3968685090000

[1,0,4,0,16,32,76,384,386,2976,3952,20520,41104,
 136160,393624,1027072,3412146,8470840,27988904,
 74155272,230939032,655493408,1942645984,
 5765577688,16807041186,50708538824,148118970352,
 446903215688,1320213337712,3968685090000]

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Last modified December 8 08:49 EST 2019. Contains 329862 sequences. (Running on oeis4.)