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A306003 as a simple table

n a(n)
1 0
2 0
3 1
4 4
5 18
6 107
7 846
8 11122
9 261212
10 11717906
11 1006716728
12 164060156360
13 50335920919080
14 29003488522658695
15 31397381311096116107
16 63969560164236980493127
17 245871831711291931225960094
18 1787331725280413408599670721723
19 2463602142946396333256221557990652

[0,0,1,4,18,107,846,11122,261212,11717906,
 1006716728,164060156360,50335920919080,
 29003488522658695,31397381311096116107,
 63969560164236980493127,
 245871831711291931225960094,
 1787331725280413408599670721723,
 2463602142946396333256221557990652]

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Last modified October 18 18:03 EDT 2021. Contains 348068 sequences. (Running on oeis4.)