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A006366 as a simple table

na(n)
01
12
25
320
4132
51452
626741
7826540
842939620
93752922788
10552176360205
11136830327773400
1257125602787130000
1340191587143536420000
1447663133295107416936400
1595288872904963020131203520
16321195665986577042490185260608

[1,2,5,20,132,1452,26741,826540,42939620,
 3752922788,552176360205,136830327773400,
 57125602787130000,40191587143536420000,
 47663133295107416936400,
 95288872904963020131203520,
 321195665986577042490185260608]