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A306739 as a simple table

n a(n)
0 1
1 1
2 4
3 9
4 156
5 650
6 5034
7 26054
8 4270304
9 27617616
10 198832320
11 6251899104
12 46466835072
13 5033625978576
14 37552294300416
15 793996577407560
16 6563364026374464
17 13221301266369115200
18 114481557932032050048
19 1114510139284499182656
20 109640692903857698897280

[1,1,4,9,156,650,5034,26054,4270304,27617616,
 198832320,6251899104,46466835072,5033625978576,
 37552294300416,793996577407560,6563364026374464,
 13221301266369115200,114481557932032050048,
 1114510139284499182656,109640692903857698897280]

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Last modified January 28 17:21 EST 2022. Contains 350657 sequences. (Running on oeis4.)