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A340534 as a simple table

n a(n)
1 2
2 0
3 30
4 0
5 15015
6 0
7 37182145
8 9699690
9 33426748355
10 0
11 3710369067405
12 0
13 304250263527210
14 0
15 37420578814667938361329
16 0
17 18598027670889965365580513
18 0
19 107254825578022430263302818471
20 0
21 44510752614879308559270669665465
22 0
23 267064515689275851355624017992790
24 0
25 116431182179248680450031658440253681535
26 0

[2,0,30,0,15015,0,37182145,9699690,33426748355,0,
 3710369067405,0,304250263527210,0,
 37420578814667938361329,0,
 18598027670889965365580513,0,
 107254825578022430263302818471,0,
 44510752614879308559270669665465,0,
 267064515689275851355624017992790,0,
 116431182179248680450031658440253681535,0]

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Last modified July 27 08:33 EDT 2021. Contains 346304 sequences. (Running on oeis4.)