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A152320 as a simple table

na(n)
11
22
36
424
596
6500
73184
819916
9152948
101201392
1110694440
12105230548
131070644410
1411962410912
15139253305766
161788989811932

[1,2,6,24,96,500,3184,19916,152948,1201392,
 10694440,105230548,1070644410,11962410912,
 139253305766,1788989811932]