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A339648 as a simple table

n a(n)
1 1
2 0
3 2
4 4
5 16
6 62
7 290
8 1496
9 8548
10 53278
11 359076
12 2597052
13 20034252
14 163996372
15 1418326160
16 12911494594
17 123317867572
18 1232219079760
19 12848961783474
20 139505358593240
21 1573914932077692
22 18418287165450500
23 223191801317514104
24 2796501582165674166
25 36179439053130339742

[1,0,2,4,16,62,290,1496,8548,53278,359076,2597052,
 20034252,163996372,1418326160,12911494594,
 123317867572,1232219079760,12848961783474,
 139505358593240,1573914932077692,
 18418287165450500,223191801317514104,
 2796501582165674166,36179439053130339742]

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Last modified May 23 02:40 EDT 2024. Contains 372758 sequences. (Running on oeis4.)