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A057585 as a simple table

n a(n)
1 0
2 1
3 4
4 16
5 56
6 190
7 624
8 2014
9 6412
10 20219
11 63284
12 196938
13 610052
14 1882717
15 5792528
16 17776102
17 54433100
18 166374109
19 507710420
20 1547195902
21 4709218604
22 14318240578
23 43493134160
24 132003957436
25 400337992056
26 1213314272395

[0,1,4,16,56,190,624,2014,6412,20219,63284,196938,
 610052,1882717,5792528,17776102,54433100,
 166374109,507710420,1547195902,4709218604,
 14318240578,43493134160,132003957436,400337992056,
 1213314272395]

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Last modified December 14 22:42 EST 2019. Contains 329987 sequences. (Running on oeis4.)