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A204108 as a simple table

n a(n)
0 1
1 4
2 56
3 428
4 2741
5 13247
6 52059
7 167502
8 453377
9 1047750
10 2112634
11 3808004
12 6369041
13 10436597
14 18107008
15 36365073
16 90462493
17 282733629
18 1074838721
19 4716194782
20 22663033612
21 114269420056
22 586835167740

[1,4,56,428,2741,13247,52059,167502,453377,
 1047750,2112634,3808004,6369041,10436597,18107008,
 36365073,90462493,282733629,1074838721,4716194782,
 22663033612,114269420056,586835167740]

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Last modified August 17 22:32 EDT 2018. Contains 313817 sequences. (Running on oeis4.)