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A015531 as a simple table

n a(n)
0 0
1 1
2 4
3 21
4 104
5 521
6 2604
7 13021
8 65104
9 325521
10 1627604
11 8138021
12 40690104
13 203450521
14 1017252604
15 5086263021
16 25431315104
17 127156575521
18 635782877604
19 3178914388021
20 15894571940104
21 79472859700521

[0,1,4,21,104,521,2604,13021,65104,325521,1627604,
 8138021,40690104,203450521,1017252604,5086263021,
 25431315104,127156575521,635782877604,
 3178914388021,15894571940104,79472859700521]

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Last modified November 13 12:45 EST 2019. Contains 329094 sequences. (Running on oeis4.)