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A088127 as a simple table

n a(n)
0 1
1 1
2 4
3 14
4 72
5 424
6 2960
7 23568
8 211456
9 2109056
10 23150592
11 277315840
12 3599704064
13 50331030528
14 754122723328
15 12054165272576
16 204743835156480
17 3682557441114112
18 69920454322356224
19 1397542619388248064
20 29331932133035081728
21 644973249444408197120

[1,1,4,14,72,424,2960,23568,211456,2109056,
 23150592,277315840,3599704064,50331030528,
 754122723328,12054165272576,204743835156480,
 3682557441114112,69920454322356224,
 1397542619388248064,29331932133035081728,
 644973249444408197120]

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Last modified January 25 19:09 EST 2020. Contains 331249 sequences. (Running on oeis4.)