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A278994 as a simple table

n a(n)
1 0
2 1
3 1
4 4
5 18
6 116
7 1060
8 13019
9 193425
10 3313522
11 63667788
12 1351700744
13 31390695708
14 791372281393
15 21523271532811
16 628166776833181
17 19582955637428422
18 649472761243051940
19 22833268501579122332
20 848230375982060558217

[0,1,1,4,18,116,1060,13019,193425,3313522,
 63667788,1351700744,31390695708,791372281393,
 21523271532811,628166776833181,19582955637428422,
 649472761243051940,22833268501579122332,
 848230375982060558217]

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Last modified September 25 19:04 EDT 2021. Contains 347659 sequences. (Running on oeis4.)